taxonID	type	description	language	source
8CFDFF4324AB9BF72508110AFA2A495D.taxon	discussion	Remarks. For the genus Cerastoderma, the species status of Pontocaspian material is subject of debate where morphological and increasingly molecular arguments show the possibility of sibling species occurrences (Sromek et al. 2016). The genus Didacna is relatively well established, however much uncertainty exists over distinction between the genera Monodacna, Adacna, and Hypanis. The generic concepts have shifted through time. Only lately, Kijashko in Bogutskaya et al. (2013) treated Monodacna as a subgenus of Adacna. Bueyuekmeric and Wesselingh (2018) discussed the distinction between the three genera and considered Monodacna, Adacna, and Hypanis as valid.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9378437FB0A7850CAEE580DA9628A000.taxon	biology_ecology	Status. Native to Black Sea Basin, invasive in Caspian Sea, introduced in Aral Sea but extinct there.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9378437FB0A7850CAEE580DA9628A000.taxon	distribution	Type locality. Sicily, Italy. Distribution. Native to the Mediterranean and Black Sea. Introduced in the Caspian Sea between 1917 and 1919 (Grigorovich et al. 2003).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9378437FB0A7850CAEE580DA9628A000.taxon	discussion	Taxonomic notes. This species has commonly been mentioned as Mytilaster lineatus (Gmelin, 1791), but the Caspian-Aral species lacks the ribbing typical for that species. The attribution to M. minimus is based on shell morphology but confirmation from molecular analyses is required. Remarks. Mytilaster minimus has successfully replaced Dreissena caspia and D. elata between 1938 and 1957 (Kostianoy and Kosarev 2005) in the Caspian Sea. Logvinenko and Starobogatov (1969) reported this species from the southern areas of the northern Caspian Sea, in the middle and the southern Caspian Sea down to 35 - 50 m water depth. Rarely, small individuals were found at depths down to 100 m. The species does not tolerate salinities below 7 - 8 ‰. This species was mentioned from depths between 200 and 600 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as M. lineatus). These deep records are unusual given other records and will require confirmation.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9378437FB0A7850CAEE580DA9628A000.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
185F271F2FDB5E0FCB8888383EF935DF.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea and possibly Black Sea Basin.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
185F271F2FDB5E0FCB8888383EF935DF.taxon	distribution	Type locality. Azerbaijan, Caspian Sea, Gulf of Baku is the type locality given by Vinarski and Kantor (2016) and this is written on the label of the type material. However, the type description reads " Hab. australem ripam maris caspii, in sinu Astrabadensi " [southern border of the Caspian Sea, in bight of Astrabad (= Gorgan, Iran)]. Further research on the labels and documentation is required to assess whether a new lectotype or even neotype must be assigned for Adacna laeviuscula. Distribution. Caspian Sea; limans, coastal lakes, and Danube Delta in Black Sea Basin (in case A. fragilis will be shown to be a synonym of A. laeviuscula).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
185F271F2FDB5E0FCB8888383EF935DF.taxon	discussion	Taxonomic notes. See discussion under A. fragilis. Remarks. Kijashko in Bogutskaya et al. (2013) list the presence of this species at 30 - 60 m water depth in the Caspian Sea from muddy, sandy-mud, and rarely sandy bottoms. Logvinenko and Starobogatov (1969) reported the species from the northern, middle, and southern Caspian Sea basins down to 80 - 85 m water depth. In the Caspian Sea, the species has not been found in areas with salinities below 4 ‰. However, the common occurrence of fresh (paired) specimens on beaches seen at Turali (Dagestan, Russia) and northern Azerbaijan indicates this species maintains viable populations in foreshore and possibly even shoreface habitats.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
185F271F2FDB5E0FCB8888383EF935DF.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5C4E3F60A136BE32840FB9F503A21FCA.taxon	discussion	Status. Pontocaspian species, Black Sea Basin, status uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5C4E3F60A136BE32840FB9F503A21FCA.taxon	distribution	Type locality. Odessa region, Dniester liman and Katlabhuk Lake (Ukraine: Vinarski and Kantor 2016). Distribution. Danube Delta region and NW Black Sea Basin coastal areas of Ukraine.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5C4E3F60A136BE32840FB9F503A21FCA.taxon	discussion	Taxonomic notes. We are uncertain about the status of Adacna fragilis Milaschewitch, 1908. The Black Sea Basin material has a wide variety of shapes and often is thinner and sometimes more elliptical than the Caspian A. laeviuscula. Both forms were synonymised by Graf and Cummings (2018) and indicated as a possible synonym in MolluscaBase (2018 b). However, the Black Sea Basin occurrences are recorded from (coastal) lakes and small rivers suggesting little or only partial overlap in the ecological (and especially salinity) preferences of A. laeviuscula (e. g., Munasypova-Motyash 2006 a, b, Popa et al. 2009). We are uncertain if A. fragilis might constitute a geographical subspecies (a status advocated by Grossu 1973), and further molecular analyses are needed to clarify the status of the Black Sea taxon. Remarks. The species has been reported alive by Popa et al. (2009) from the Razim Lake complex on the Romanian Black Sea coast.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5C4E3F60A136BE32840FB9F503A21FCA.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C8AABD6CE209EFE85E14167C9EC34BD.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea and Aral Sea; likely disappeared from the latter.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C8AABD6CE209EFE85E14167C9EC34BD.taxon	distribution	Type locality. The northern Caspian Sea and the Aral Sea (Vinarski and Kantor 2016). Distribution. Aral Sea (probably extinct there; Andreeva and Andreev 2003), Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C8AABD6CE209EFE85E14167C9EC34BD.taxon	discussion	Taxonomic notes. Graf and Cummings (2018) consider this species as a synonym of A. vitrea, but Kijashko in Bogutskaya et al. (2013) regards it as a valid species. The latter considers A. minima minima from the Aral Sea and A. minima ostroumovi syn. n. from the Caspian Sea as distinct geographical subspecies. The likely disappear ance of the species from the Aral Sea makes a molecular assessment of their distinctness very difficult and given the lack of other arguments we synonymise both. Furthermore, we are uncertain about the status of the subspecies Hypanis minima sidorovi Starobogatov, 1974 from the western Aral Sea. Without further data we assume it concerns a form that falls within the wide morphological variation of A. minima. We moreover are very uncertain as to the status of Hypanis minima from Holocene deposits of Aral Sea as illustrated by Filippov and Riedel (2009, fig. 4 s, t). The juvenile specimen has relatively strong cardinal teeth, onset of clear ribs, and a general shape that more resembles Monodacna caspia. Remarks. The species has been recorded mostly from the middle and southern Caspian Sea and more rarely from the eastern areas in the northern Caspian Sea down to 35 m water depth (Logvinenko and Starobogatov 1969) as well as from the Aral Sea from where it may have disappeared.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C8AABD6CE209EFE85E14167C9EC34BD.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B65214F241274F7DDBD1E76CD64A4B10.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea Basin, Black Sea Basin, and Aral Sea Basin.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B65214F241274F7DDBD1E76CD64A4B10.taxon	distribution	Type locality. " Australem oram caspii maris, Astrabadensem " [southern coast of Caspian Sea, near Astrabad (= Gorgan, Iran)]. Distribution. Black Sea Basin (also in Azov Sea and adjacent lower Don River), Caspian Sea Basin, and Aral Sea (including delta of Amu-Darya River). The Aral populations may have gone extinct in the 1980 s (Andreeva and Andreev 2003).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B65214F241274F7DDBD1E76CD64A4B10.taxon	discussion	Taxonomic notes. The species has been subdivided into three geographical subspecies which were not recognised by Graf and Cummings (2018). It concerns a species with thin shells that yield very few diagnostic characters that show overlap. Here, we synonymise the subspecies pending molecular assessments of their status.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B65214F241274F7DDBD1E76CD64A4B10.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
656A96C3FEC6A795A21AFCECD6A3128F.taxon	discussion	Status. Native Pontocaspian species (Black Sea Basin), Holocene invasive in Caspian Sea and Aral Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
656A96C3FEC6A795A21AFCECD6A3128F.taxon	distribution	Type locality. French Mediterranean. Distribution. NE Atlantic, Baltic Sea, Mediterranean, Black Sea Basin, Caspian Sea Basin, Aral Sea, isolated Saharan lakes (Plaziat 1991).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
656A96C3FEC6A795A21AFCECD6A3128F.taxon	discussion	Taxonomic notes. DNA studies have shown a strong structuring between Atlantic-western Mediterranean, Ionian, and Aegean-Pontocaspian populations of C. glaucum (Nikula and Vaeinoelae 2003, Sromek et al. 2016). According to Sromek et al. (2016: 515), the " strong genetic differentiation and the occurrence of private alleles may hint at the presence of cryptic species within C. glaucum ". For a discussion on the authority of C. glaucum, see Vinarski and Kantor (2016: 69 - 70). Remarks. The arrival of Cerastoderma glaucum in the Caspian Sea circa 8000 years ago has been linked to human settlement expansion through the Manych corridor (Fedorov 1957, Yanina 2009). It would be among the earliest human-mediated dispersal events for invertebrate species known to date.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
656A96C3FEC6A795A21AFCECD6A3128F.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E569463F65597FAA731552624524F999.taxon	discussion	Status. Native Pontocaspian species (Black Sea Basin), introduced to Caspian Sea and Aral Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E569463F65597FAA731552624524F999.taxon	distribution	Distribution. Black Sea (including Sea of Azov), Caspian Sea, Aral Sea, Aegean.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E569463F65597FAA731552624524F999.taxon	discussion	Taxonomic notes. This concerns a common rhomboid-shaped species in the Pontocaspian region whose name is uncertain. It has a short ligament in common with C. glaucum and the persistent occurrence of ribs on the posterior margin, the well-defined character of the ribs and the regular occurrence of scales in common with western European C. edule. This form has been often referred to as C. rhomboides (Lamarck, 1819) that has been described from the Italian Pliocene but that concerns a typical glaucum form (Fig. 2), not the rhomboid form of the Pontocaspian Cerastoderma. The species has been named Cardium edule var. nuciformis by Milaschewitch (1916), but that name is a junior primary homonym of Cardium nuciforme d'Orbigny, 1850. Even though some morphological features mentioned in the description of C. lamarcki (Reeve, 1845) may resemble those of the Pontocaspian species, the former has been traced to southern Great Britain from where molecular analyses only show the presence of C. glaucum (Nikula and Vaeinoelae 2003).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E569463F65597FAA731552624524F999.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB82FC816F9774399DFFCCED22ACC90F.taxon	description	Fig. 3 a	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB82FC816F9774399DFFCCED22ACC90F.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB82FC816F9774399DFFCCED22ACC90F.taxon	distribution	Type locality. Caspian Sea, offshore Turkmenistan, station 132, 40 ° 32 ' N, 52 ° 23 ' E. Distribution. Logvinenko and Starobogatov (1969) reported Didacna baeri from the southern basin (mostly on the eastern side) and from the middle basin down to 60 m water depth.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB82FC816F9774399DFFCCED22ACC90F.taxon	discussion	Taxonomic notes. In recent works (e. g., Kijashko in Bogutskaya et al. 2013), the species Didacna crassa (Eichwald, 1829) [= D. eichwaldi (Krynicki, 1837)] has been considered a synonym of D. baeri. However, both species can be distinguished. Didacna baeri has a less extended, more roundish shell, a less developed keel, and a low top with less projecting beak and in general more ribs than D. eichwaldi (Fig. 3). Didacna baeri occurred for the first time in the Novocaspian transgressive deposits whereas D. crassa already occurred in the late Khvalynian (Late Pleistocene). Both became very common during the Novocaspian.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB82FC816F9774399DFFCCED22ACC90F.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
24FFE2EAEB36835737339869D2812A9A.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
24FFE2EAEB36835737339869D2812A9A.taxon	distribution	Type locality. Caspian Sea, station 116, 44 ° 17 ' N, 50 ° 22 ' E. Distribution. Southern, middle, and southern part of the northern Caspian Sea down to 40 m water depth, preferentially on sandy sediments (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
24FFE2EAEB36835737339869D2812A9A.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1F11EE49079F1762CDA09D5E97696639.taxon	description	Fig. 3 b	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1F11EE49079F1762CDA09D5E97696639.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1F11EE49079F1762CDA09D5E97696639.taxon	distribution	Type locality. " Caspium mare " (Caspian Sea) (for C. crassum Eichwald, 1829). Distribution. Caspian Sea. Didacna eichwaldi is known from the middle and southern Caspian Sea basins down to 35 m water depth and cannot tolerate lowered salinities.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1F11EE49079F1762CDA09D5E97696639.taxon	discussion	Taxonomic notes. In recent works (Kijashko in Bogutskaya et al. 2013), the species Didacna crassa (Eichwald, 1829) [= D. eichwaldi (Krynicki, 1837)] has been considered a synonym of D. baeri. However, we see morphological discontinuities in our extensive material from the northern Caspian Sea Basin that implies that D. eichwaldi with its protruding umbo and shouldered appearance is distinct from D. baeri that is characterised by a rounded umbo (see discussion above under D. baeri). Despite being in common usage, the name Didacna crassa is invalid as it is a junior homonym of Cardium crassum Gmelin, 1791; Krynicki (1837) introduced Cardium eichwaldi as replacement name.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1F11EE49079F1762CDA09D5E97696639.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3CBA52757AD17F44955A30D97051A518.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3CBA52757AD17F44955A30D97051A518.taxon	distribution	Type locality. Caspian Sea, offshore Azerbaijan, approximately 40 ° 39 ' N, 50 ° 26 ' E. Distribution. Southern and middle Caspian Sea basins and southern part of the northern Caspian Sea down to 30 - 40 m water depth. The species often co-occurs with D. barbotdemarnii.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3CBA52757AD17F44955A30D97051A518.taxon	discussion	Remarks. We are uncertain about the status of Didacna carinata Nevesskaja, 2007. The overall outline resembles that of D. barbotdemarnii, but the former species appears smaller and thinner. Kijashko in Bogutskaya et al. (2013) considered D. carinata as a synonym of D. longipes.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3CBA52757AD17F44955A30D97051A518.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B7F9FB0E5CD3AA1F237CEB60D916F11C.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B7F9FB0E5CD3AA1F237CEB60D916F11C.taxon	distribution	Type locality. Khala, Apsheron Peninsula, Azerbaijan (early Khvalynian, Late Pleistocene). Distribution. Caspian Sea, southern basin and western part of middle basin between 50 - 85 m water depth (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017), but we are not certain whether it concerns living specimens.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B7F9FB0E5CD3AA1F237CEB60D916F11C.taxon	discussion	Remarks. Didacna parallela has been considered as extinct by Nevesskaja (2007) but was nevertheless treated in Kijashko in Bogutskaya et al. (2013). Live records are known at least until 1986 and we have no particular reason to assume it is extinct.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B7F9FB0E5CD3AA1F237CEB60D916F11C.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7B654135C45D39416BD933AB4224F9BC.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea. Possibly extinct.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7B654135C45D39416BD933AB4224F9BC.taxon	distribution	Type locality. Apsheron Peninsula, Azerbaijan, Quaternary. Distribution. Caspian Sea. Logvinenko and Starobogatov (1969) reported the species from the southern Caspian Sea Basin and the southern part of the middle Caspian Sea Basin down to 60 m water depth. The species has been collected from Holocene deposits and beach occurrences the western part of the middle Caspian Sea Basin as well (FW, pers. obs.). The species is reportedly extinct, not mentioned in Kijashko in Bogutskaya et al. (2013).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7B654135C45D39416BD933AB4224F9BC.taxon	discussion	Remarks. The first appearance of Didacna praetrigonoides is in lower Khvalynian deposits, it became widespread during the late Khvalynian and was rare during the Novocaspian.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7B654135C45D39416BD933AB4224F9BC.taxon	conservation	Conservation status. Not assessed. Didacna praetrigonoides has been reported to occur ' rarely in the modern Caspian Sea' (Nevesskaja 2007: 927), but material from recent assemblages has not been found.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B9F6698B2197A0AE8D2050D1E7F75FF6.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B9F6698B2197A0AE8D2050D1E7F75FF6.taxon	distribution	Type locality. Central part of the Caspian Sea, 39 ° 38 ' N, 52 ° 02 ' E (offshore Turkmenistan). Distribution. Middle and southern basins of Caspian Sea between 75 and 409 m water depth (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 600 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B9F6698B2197A0AE8D2050D1E7F75FF6.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8AA4F0B64E0A1BAE1C69C70211C0EC86.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8AA4F0B64E0A1BAE1C69C70211C0EC86.taxon	distribution	Type locality. The type series (? Recent, Caspian Sea) was reported as lost by Nevesskaja (2007) who introduced a neotype from the Elton Lake surroundings in the northern Caspian plains, Russia (early Khvalynian, Late Pleistocene). Distribution. Middle and southern Caspian Sea basins; it is most common in the middle basin at 25 - 85 m water depth (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8AA4F0B64E0A1BAE1C69C70211C0EC86.taxon	discussion	Taxonomic notes. According to Logvinenko and Starobogatov (1969), two subspecies occur in the Caspian Sea at different depth ranges: D. protracta protracta at 25 - 50 m and D. protracta submedia Andrusov, 1910 at 50 - 85 m. The latter differs from D. p. protracta by the relative posterior location of the umbo that is furthermore subdued. Both forms of Didacna protracta are widespread in the Khvalynian deposits of the Caspian Sea and Manych depression. According to Kijashko in Bogutskaya et al. (2013) morphological differences characteristic for the subspecies of Didacna protracta are due to allometric growth. The mere difference in depth distribution, with overlapping depths and intermediate forms, does not provide any argument to maintain these subspecies. Didacna protracta is the type species of the subgenus Protodidacna Logvinenko & Starobogatov, 1966. Remarks. The authorship attribution of this species to Eichwald (1829) as proposed by several authors was rejected in Vinarski and Kantor (2016). According to them, Cardium protractum Eichwald, 1829, described from the western Ukraine, probably refers to a different species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8AA4F0B64E0A1BAE1C69C70211C0EC86.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
160F50414B32B0210D605913A4A69CB2.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
160F50414B32B0210D605913A4A69CB2.taxon	distribution	Type locality. Caspian Sea, offshore Azerbaijan, 39 ° 47 ' N, 49 ° 59 ' 30 " E (Kijashko in Bogutskaya et al. 2013). Distribution. Caspian Sea: southern basin and southern part of the middle basin at depths between 30 - 100 m (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
160F50414B32B0210D605913A4A69CB2.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D46BB099B347588C087D486A676CE34A.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D46BB099B347588C087D486A676CE34A.taxon	distribution	Type locality. Caspian Sea, a neotype has been designated based on a specimen from Chechen Island by Nevesskaja (2007, pl. 24, fig. 4). Distribution. Caspian Sea, mostly eastern part of northern Caspian Sea Basin (Logvinenko and Starobogatov 1969). Furthermore found in living position in Novocaspian deposits near Turali, Dagestan (western part middle basin; FW).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D46BB099B347588C087D486A676CE34A.taxon	discussion	Remark. Genetic data are available through Albrecht et al. (2014).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D46BB099B347588C087D486A676CE34A.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1250F071F221B21FFD0054084886D4B0.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea Basin and Black Sea Basin.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1250F071F221B21FFD0054084886D4B0.taxon	distribution	Type locality. " Sinum Astrabadensem " [Caspian Sea near Astrabad (= Gorgan, Iran)]. Distribution. Caspian Sea, western liman coast Black Sea Basin.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1250F071F221B21FFD0054084886D4B0.taxon	discussion	Taxonomic notes. The Black Sea populations of H. plicata show a large range of morphological variation with elongated specimens that cannot be distinguished from Caspian H. plicata to severely stunted and irregularly shaped specimens that have been considered as a subspecies (H. plicata relicta) or as distinct species (H. dolosmiana) (e. g., Munasypova-Motyash 2006 a). These forms have intermediates indicating that the Black Sea Basin specimens are a single species that should be attributed to H. plicata even though the latter appear to have lived under lower salinities than their Caspian counterparts. Molecular studies are required to elucidate the status of the Black Sea Basin material.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1250F071F221B21FFD0054084886D4B0.taxon	conservation	Conservation status. Not assessed. Fresh shells (including paired specimens) have been found at several beaches around the Caspian Sea (Turali, Dagestan, Russia; Suraabad, Azerbaijan; FW). The species has been reported alive from the Razim lake complex of the Romanian Black Sea coast by Popa et al. (2009).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
733984E276663929009686D076CE3607.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
733984E276663929009686D076CE3607.taxon	distribution	Type locality. " Northern Caspian Sea on the central part of the slope " (Vinarski and Kantor 2016: 66), which likely refers to northern slope of the middle Caspian Sea Basin. Distribution. Caspian Sea (middle Caspian Sea Basin).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
733984E276663929009686D076CE3607.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
70C6F8FF2D4C33B61AED1C3F236290E2.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
70C6F8FF2D4C33B61AED1C3F236290E2.taxon	distribution	Type locality. " Western Caspian Sea southeastwards from Derbent " (Vinarski and Kantor 2016: 66). Distribution. Caspian Sea (middle and southern Caspian Sea Basin). This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Hypanis albida).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
70C6F8FF2D4C33B61AED1C3F236290E2.taxon	discussion	Taxonomic notes. This species is part of a group of Caspian Monodacna with relative flat and wedge-shaped shells with low and sometimes poorly defined ribs (M. albida, M. polymorpha). Like for the Monodacna caspia group (see below), we are in need of studies to assess whether these taxa might form ecomorphs of a single species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
70C6F8FF2D4C33B61AED1C3F236290E2.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E6143EBBC5A7E7586F98A22A51797E0C.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E6143EBBC5A7E7586F98A22A51797E0C.taxon	distribution	Type locality. " Caspium mare " [Caspian Sea]. Distribution. Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E6143EBBC5A7E7586F98A22A51797E0C.taxon	discussion	Taxonomic notes. The Monodacna caspia group (M. caspia, M. filatovae, and M. knipowitschi) comprises three (sub-) species that all share the relatively convex and rounded shell and well-defined ribbing. These species have been described from different areas and habitats in the Caspian Sea and have been morphologically characterised by Kijashko in Bogutskaya et al. (2013). However, neither morphological analyses of intermediate populations nor genetic analyses have been performed to clarify if the three taxa are distinct or ecomorphs of a single species. We are therefore uncertain whether M. filatovae and M. knipowitschi should be maintained.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E6143EBBC5A7E7586F98A22A51797E0C.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8EBE9655691F9C4054F905542F1E5343.taxon	discussion	Status. Pontocaspian species, native to Black Sea Basin (including lower Danube River), invasive in Caspian Sea and Volga River.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8EBE9655691F9C4054F905542F1E5343.taxon	distribution	Type locality. " Hypanin fluvium, ad nigrum usque mare " [Lower course of the Yuzhnyi Bug River, all the way to the Black Sea, Ukraine]. Distribution. Native to all Black Sea Basin Pontocaspian habitats and lower courses of adjacent rivers such as the Danube, Dnieper, and Dniester; invasive in Caspian Sea Basin and lower Volga, as well as Lake Balkhash (Kazakhstan). Occurs hundreds of kilometres upstream in major tributaries (Danube: Popa et al. 2009; recent observations in Volga River upstream Volgograd by MV and AFS).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8EBE9655691F9C4054F905542F1E5343.taxon	discussion	Taxonomic notes. Monodacna colorata appears to be a morphologically very variable species. Here, we propose to synonymise several local Black Sea species with this taxon. Given the difficulty to distinguish relatively flat shells typically associated with M. colorata from the more convex shells typically associated with M. pontica in, e. g., Lake Razim (Romania) and the apparent lack of genetic differentiation of convex specimens from M. colorata we assume that M. pontica is a synonym of M. colorata. Shell differences have been attributed to substrate differences. Further investigations to confirm the synonymy are required. Monodacna angusticostata was synonymised by Popa et al. (2012) based on molecular evidence, even though some morphological distinction was reported from M. colorata, which they attributed to differential habitat preference (sediment type).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8EBE9655691F9C4054F905542F1E5343.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
01508CAED4A23D434B2A65CF101D40FC.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea. Uncertain whether it concerns a morph of M. caspia.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
01508CAED4A23D434B2A65CF101D40FC.taxon	distribution	Type locality. Gulf of Baku, Caspian Sea, Azerbaijan. Distribution. Southern Caspian Sea Basin.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
01508CAED4A23D434B2A65CF101D40FC.taxon	discussion	Taxonomic notes. See remarks under Monodacna caspia above for uncertain status of M. filatovae.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
01508CAED4A23D434B2A65CF101D40FC.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
154E7433FB8E195C7212678C4AA3B698.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea. Uncertain whether it concerns a morph of M. caspia.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
154E7433FB8E195C7212678C4AA3B698.taxon	distribution	Type locality. Middle Caspian Sea Basin. Distribution. Caspian Sea (middle and southern basins). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Hypanis caspia knipowitchi).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
154E7433FB8E195C7212678C4AA3B698.taxon	discussion	Taxonomic notes. See remarks under Monodacna caspia above for uncertain status of M. knipowitschi.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
154E7433FB8E195C7212678C4AA3B698.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D510C74DAB1B68CE1212328EE3549494.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea. Status uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D510C74DAB1B68CE1212328EE3549494.taxon	distribution	Type locality. Central part of northern Caspian Sea. Distribution. Northern Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D510C74DAB1B68CE1212328EE3549494.taxon	discussion	Taxonomic notes. See remarks under M. albida for uncertain species status.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D510C74DAB1B68CE1212328EE3549494.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
14171673F5F7BCFC070A7D9A2CD84D92.taxon	discussion	Status. Pontocaspian species, endemic to Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
14171673F5F7BCFC070A7D9A2CD84D92.taxon	distribution	Type locality. Off Tokmak Cape (also as Toqmaq Mueyis), southern Kazakhstan, Caspian Sea. Distribution. Middle Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
14171673F5F7BCFC070A7D9A2CD84D92.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9F592DC175E67A8A5ED989A060D3BE37.taxon	discussion	Status. Invasive Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9F592DC175E67A8A5ED989A060D3BE37.taxon	distribution	Type locality. Mediterranean coast near Taranto (Italy). Distribution. Mediterranean, Black Sea coastal regions, Sea of Azov, Caspian Sea, Aral Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9F592DC175E67A8A5ED989A060D3BE37.taxon	discussion	Taxonomic notes. This species has been reported in much of the 20 th century literature as Abra ovata (Philippi, 1836), which is invalid since the original name (Erycina ovata Philippi, 1836) represents a junior primary homonym of Erycina ovata Gray, 1825. Remarks. The first transfer of Abra segmentum into the Caspian Sea occurred in 1947 - 1948, and the species has not been detected since 1955 (Latypov, 2015).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9F592DC175E67A8A5ED989A060D3BE37.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4A3DCD4CF5C2F0183F697661DC1FD6A6.taxon	discussion	Status. Native / Invasive Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4A3DCD4CF5C2F0183F697661DC1FD6A6.taxon	distribution	Type locality. Euphrates River. Distribution. Native to large parts of western Asia (including southern Caspian river systems) and northern Africa, introduced in 1939 to southern North America and in 1980 from there to Europe (Seddon and Van Damme 2016). The species has been recently recorded from the Caspian Dagestan coast (Nabozhenko and Nabozhenko 2016).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4A3DCD4CF5C2F0183F697661DC1FD6A6.taxon	discussion	Remarks. This species has been native to south Caspian rivers including the Kura river system (Zhadin 1952) and has expanded several times in the Late Pleistocene into the Caspian Sea, where in time intervals it survived in proximal lacustrine habitats. A recent introduction and expansion of the species has been recorded in the Kizlyarsky Gulf in Dagestan (Nabozhenko and Nabozhenko 2016) and the strong increase in fresh material found around the gulf in subsequent years, including whole specimens (AS Gasanova, Makhachkala, pers. comm.) suggests the species may have established there.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4A3DCD4CF5C2F0183F697661DC1FD6A6.taxon	conservation	Conservation status. Least Concern (Seddon and Van Damme 2016).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D49ECA3749B43F62D1B4783600843A14.taxon	discussion	Remarks. Pontocaspian dreissenid taxonomy suffers from a lack of coordinated shell and DNA analyses. A large part of our considerations relies on the work of Rosenberg and Ludyanskiy (1994) who examined and illustrated all type material of Pontocaspian Dreissena.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
166EA6655E5C28AFB3E069A600309831.taxon	discussion	Status. Until mid- 20 th century endemic to northern Black Sea liman coast, since then invasive elsewhere in Black Sea Basin, Volga catchment, western Europe, and North America.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
166EA6655E5C28AFB3E069A600309831.taxon	distribution	Type locality. Bug Liman near Nikolaev, Ukraine. Distribution. Endemic to western Ukrainian liman coast, introduced in Danube Delta, Azov Sea, Volga catchment, western and central Europe, and North America (Orlova et al. 2005, Coughlan et al. 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
166EA6655E5C28AFB3E069A600309831.taxon	discussion	Taxonomic notes. This species has been considered as a subspecies of D. rostriformis (Deshayes, 1838) by some authors (e. g., Orlova et al. 2005), yet we follow the argumentation of Kijashko in Bogutskaya et al. (2013) to consider it as a distinct species. The proposed synonymy of Caspian D. rostriformis (= D. grimmi) and Black Sea D. bugensis by Stepien et al. (2013) is discussed below under D. grimmi.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
166EA6655E5C28AFB3E069A600309831.taxon	conservation	Conservation status. Least Concern (von Rintelen and Van Damme 2011 a).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D3884EC6E793F9E9BC26320AF72A444B.taxon	discussion	Status. Caspian endemic, probably extinct.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D3884EC6E793F9E9BC26320AF72A444B.taxon	distribution	Type locality. Chistyi Bank and Cheleken Island, Caspian Sea, Russia. Distribution. Caspian Sea and Aral Sea, probably extinct.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D3884EC6E793F9E9BC26320AF72A444B.taxon	discussion	Taxonomic notes. The species is commonly subdivided into a Caspian subspecies (D. caspia caspia) and an Aral Sea subspecies (D. caspia pallasi Andrusov, 1897). However, syntypes of the latter illustrated in Rosenberg and Ludyanskiy (1994, fig. 3 f) show a broad and keeled Dreissena that has major morphological characters in common with D. polymorpha / elata rather than D. caspia. Filippov and Riedel (2009) reported Dreissena caspia from Holocene core deposits of Aral Sea, but given the juvenile status of their material they noted they were uncertain whether it might comprise D. polymorpha. Dreissena caspia was reported alive from the remaining " small Aral Sea " by Plotnikov et al. (2016). However, this latter record concerns more likely D. polymorpha and needs confirmation. Andreeva and Andreev (2003) mentioned that this subspecies has not been found in the Aral Sea since 1989.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D3884EC6E793F9E9BC26320AF72A444B.taxon	conservation	Conservation status. Critically endangered, possibly extinct (von Rintelen and Van Damme 2011 b).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B1EFAF16DA62C4AB4576FCD817F475C3.taxon	discussion	Status. Pontocaspian species, endemic to the Caspian Sea, probably extinct. Species status uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B1EFAF16DA62C4AB4576FCD817F475C3.taxon	distribution	Type locality. Kuuli Cape, Dazmyk, Apsheron Peninsula, Azerbaijan (Vinarski and Kantor 2016). Distribution. Caspian Sea. Probably extinct.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B1EFAF16DA62C4AB4576FCD817F475C3.taxon	discussion	Taxonomic notes. Dreissena elata has morphological features in common with D. polymorpha, including a relatively wide shell and a well-pronounced keel located close to the ventral margin. However, the D. elata shell is in general wider, flatter, and has a more rounded abapical margin even though shell characters are higly variable. Dreissena elata has been reported from areas in the Caspian Sea with salinities well above 5 ‰, which is unusual for D. polymorpha elsewhere. We are uncertain whether D. elata might be a sibling species. Its apparently distinct morphology and autecological preferences suggest it is different from D. polymorpha, but it will require molecular comparison to investigate whether it concerns a mere morph that has undergone " ecological release " (Kohn 1972) or is a different species. However, no living specimens of D. elata have been recorded since 1957 (Kostianoy and Kosarev 2005) when its Caspian habitats were invaded by Mytilaster minimus.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B1EFAF16DA62C4AB4576FCD817F475C3.taxon	conservation	Conservation status. Not assessed. It was reported as extinct by Kostianoy and Kosarev (2005, and references therein). If D. elata is accepted as a valid species, it might qualify for the same conservation status as D. caspia (critically endangered, possibly extinct; von Rintelen and Van Damme 2011 b).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A2F66A8F8031EE8B1ED7BC3D1DD9F358.taxon	description	Fig. 4 b	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A2F66A8F8031EE8B1ED7BC3D1DD9F358.taxon	discussion	Status. Caspian Sea endemic.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A2F66A8F8031EE8B1ED7BC3D1DD9F358.taxon	distribution	Type locality. Caspian Sea. Distribution. Middle to southern Caspian Sea basins. This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as D. rostriformis compressa) and found living offshore Aktau (Kazakhstan) in 2017 below 20 m water depth.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A2F66A8F8031EE8B1ED7BC3D1DD9F358.taxon	discussion	Taxonomic notes. This Caspian species is very often cited as Dreissena rostriformis. Rosenberg and Ludyanskiy (1994: 1497) discuss the uncertainties of this attribution but state that " D. pontocaspica, D. distincta, D. compressa, and D. grimmi are synonyms of D. rostriformis " even though they find " some justification for maintaining a distinction between an extinct subspecies, D. rostriformis rostriformis and a living one, for which D. rostriformis grimmi is the oldest name ". Their figure of the lectotype of D. rostriformis (Rosenberg and Ludyanskiy 1994: fig. 2 a), which derives from Pliocene deposits of the Black Sea Basin, concerns a relative small, thick-shelled, and low Dreissena with a pointed beak and lacking a keel. On interior view, the shell area outside the pallial line is thick. Deshayes's lectotype has several characters in common with modern Caspian D. rostriformis and the closely related Black Sea Basin D. bugensis. Yet, the Pliocene form has a broader umbonal area that results in a more subquadrangular shape, which is different from the modern Caspian Dreissena that have tear-drop to pear-shaped shells. The subquadrangular shape of Deshayes's material is even more pronounced in the pallial line on the shell's interior, a feature not seen in any modern Caspian material. The Pliocene Black Sea D. rostriformis has its general shape in common with Apsheronian (Early Pleistocene) Caspian dreissenids referred to as D. carinatocurvata as illustrated in Kolesnikov (1950, pl. 14, figs 14 - 16). Hence, we conclude that the recent Caspian species should be treated different from Pliocene D. rostriformis and the name D. grimmi should be applied instead. Various subspecies have been attributed to Caspian Dreissena rostriformis (see, e. g., Kijashko in Bogutskaya et al. 2013 for a synonymy list). Even though morphological differences appear to be large, intermediates are known between the morphs. Stepien et al. (2013) reviewed molecular evidence for species boundaries within Dreissena. They concluded that (1) all Caspian Sea forms that have been mentioned in literature as (sub-) species of D. rostriformis (= D. grimmi) are one and the same species and (2) there is not enough molecular evidence and great difficulty in morphology to separate the Caspian species from the Black Sea Basin D. bugensis. We agree with the first point made by Stepien et al. (2013); all forms reported from the middle and southern Caspian Sea basins appear to be mere morphs of a single species, a feature also noted by Rosenberg and Ludyanskiy (1994). However, we disagree with their second proposal. Dreissena bugensis and D. grimmi have non-overlapping ecological tolerances and are separated geographically (Rosenberg and Ludyanskiy 1994). This fact together with the very limited but consistent genetic differentiation suggests that it may concern very recently evolved sister species. In the early 1980 s, D. bugensis was introduced in the Volga (Zhulidov et al. 2005) and since then spread from there to central and western Europe and North America. So far, Dreissena bugensis has only been reported from the Volga itself and its delta but not from the northern Caspian Sea Basin. If it would be conspecific with the middle-southern Caspian species, which lives at higher salinities and deeper habitats, we would expect that the invasive populations in the north would have been blended with the Caspian population in the south. With no such intermediate populations found so far we consider both taxa as viable species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A2F66A8F8031EE8B1ED7BC3D1DD9F358.taxon	conservation	Conservation status. Least Concern (for Dreissena rostriformis; von Rintelen and Van Damme 2011 c).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1C3AD8A8ACB8352D4BC610D4A28D42A2.taxon	discussion	Status. Native Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1C3AD8A8ACB8352D4BC610D4A28D42A2.taxon	distribution	Type locality. Volga and Yaik (Ural) rivers, Caspian Sea. Distribution. Eurasian (native and invasive), North America (invasive) rivers, lakes, estuaries, deltas (Rosenberg and Ludyanskiy 1994, Cummings and Graf 2015, Coughlan et al. 2017). Several unique forms / species within this group reported from the Pontocaspian region.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1C3AD8A8ACB8352D4BC610D4A28D42A2.taxon	discussion	Taxonomic notes. Dreissena polymorpha has been subject of intense DNA and ecological studies, but rarely were Caspian communities involved. Combined insights into the shell morphology, ecology, and molecular biology has to date not fully resolved several aspects of Pontocaspian records of this species. Occurrences in rivers and deltas of the Pontocaspian region are consistently attributed to Dreissena polymorpha. However, slightly deviating morphs exist (ed) in salinities typically not favoured by D. polymorpha elsewhere in the Caspian and Aral seas. A particular form of Dreissena polymorpha, documented by Kijashko in Bogutskaya et al. (2013), viz. D. polymorpha andrusovi (his figure 118 b) will need further study as it has many morphological similarities with D. caspia (including general shape, location of semidiameter, and broad flat shape of hinge platform).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1C3AD8A8ACB8352D4BC610D4A28D42A2.taxon	conservation	Conservation status. Least Concern (Van Damme 2014).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
73E26BC97757D71A8C07F10ADFD2E23C.taxon	discussion	Status. Invasive Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
73E26BC97757D71A8C07F10ADFD2E23C.taxon	distribution	Type locality. Southern coast of eastern United States. Distribution. Black Sea Basin, Caspian Sea, coasts of western Europe, Caribbean, and northern South America.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
73E26BC97757D71A8C07F10ADFD2E23C.taxon	discussion	Remarks. The species, native to the southern coast of North America, was first introduced in Europe in 1835 (Heiler et al. 2010). In the Pontocaspian region, it first appeared in the northern Black Sea Basin in 2002 and was first collected in the Caspian Sea in 2009 (Heiler et al. 2010). It is easily distinguished from Pontocaspian dreissenids by the presence of an aphophysis near the hinge.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
73E26BC97757D71A8C07F10ADFD2E23C.taxon	conservation	Conservation status. Least Concern (Cummings 2011).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1636A415D7A2210C1021C2471FF3F203.taxon	discussion	Status. Accepted native species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1636A415D7A2210C1021C2471FF3F203.taxon	distribution	Type locality. Danube River, Vienna, Austria. Distribution. Danube River catchment, central to south-eastern Europe, as well as northern Italy (Feher et al. 2009).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1636A415D7A2210C1021C2471FF3F203.taxon	discussion	Taxonomic notes. The latest phylogenetic data supports a sister relationship between Theodoxus danubialis and the clade containing T. fluviatilis and T. velox (AFS, unpublished data). Some authors believe T. danubialis and T. prevostianus may represent different species given some level of genetic, ecological, and morphological differentiation (Feher et al. 2009, Welter-Schultes 2012; but see also Bandel 2001). More recent unpublished results may suggest that the genetic level of differentiation between these species is more indicative of intraspecific diversity within a single species (AFS, unpublished data).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1636A415D7A2210C1021C2471FF3F203.taxon	conservation	Conservation status. Least Concern (Tomovic et al. 2010).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
ABE05AC13B25FE4D2B9DC0FD36176BEC.taxon	discussion	Status. Accepted native species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
ABE05AC13B25FE4D2B9DC0FD36176BEC.taxon	distribution	Type locality. Near Uppsala, Sweden. The lectotype was designated by Anistratenko (2005). Distribution. Widely distributed all over Europe, Anatolia, and north-western Africa. Within the Pontocaspian region, it is a common component of the lower reaches of Black and Azov Sea drainages (specifically in Bulgaria, Romania, and Ukraine). Towards the east, the species extends at least as far as the Don River system in Russia and the coastal rivers of Georgia, but it is absent from the Caspian system. Records of this species from Iran and western Asia are likely misidentifications (AFS, unpublished data).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
ABE05AC13B25FE4D2B9DC0FD36176BEC.taxon	discussion	Taxonomic notes. Theodoxus fluviatilis exhibits considerable variation in shell colouration and shape (Gloeer and Pesic 2015). Unpublished molecular data confirm the synonymy of a number of taxa such as Theodoxus euxinus syn. n., T. danasteri, and T. subthermalis syn. n., and further suggest the inclusion of T. saulcyi and T. heldreichi (AFS, unpublished data). A final decision concerning the status of T. dniestroviensis Put', 1972 described from the Dniester River (Rukhotyn village, Khotyn district, Chernivtsi region, Ukraine) is not possible at the moment. Despite appropriate efforts, we were unable to trace the type specimens of this species. Based on the original description and illustration (Put' 1972) it was considered as a junior synonym of T. fluviatilis by Anistratenko et al. (1999) having an unusual colour pattern. Theodoxus milachevichi was described as a subfossil from the Crimean coast. It closely resembles morphotypes of both T. fluviatilis and T. velox V. Anistratenko in O. Anistratenko et al., 1999 and might be synonym of either species (compare type material illustrated in Kantor and Sysoev 2006). However, the morphological variability of the taxa involved, as well as the lacking possibility of acquiring genetic data for T. milachevichi, complicates a decision on the independence or synonymy of this species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
ABE05AC13B25FE4D2B9DC0FD36176BEC.taxon	conservation	Conservation status. Least Concern (Kebapci and Van Damme 2012).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9171CCC870710181E43B950E6AA5C82A.taxon	discussion	Status. Accepted Pontocaspian species, name uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9171CCC870710181E43B950E6AA5C82A.taxon	distribution	Type locality. " Inter Fucos littoris Derbendensis viva " (living among algae on the shores of Derbent), Dagestan, Russia. Distribution. Present along the Caspian Sea shores, in the Volga River, and the Sea of Azov. Lived until the late 1980 s in the Aral Sea but is possibly extinct there now (Andreev et al. 1992, Aladin et al. 1998, Micklin et al. 2014).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9171CCC870710181E43B950E6AA5C82A.taxon	discussion	Taxonomic notes. Eichwald (1838) introduced the species Neritina liturata based on material from the shores of Derbent (Dagestan, Russia, northwestern Caspian Sea). That name is invalid as it is a junior primary homonym of N. liturata Schultze, 1826; it was replaced by Lindholm (1924) with Theodoxus pallasi (see also Anistratenko et al. 2017). Theodoxus pallasi is a widely used name, but a major nomenclatural change might be due. Unpublished molecular data suggest that all Theodoxus from the Caspian Sea, Azov Sea, and Armenian lakes Sevan and Yerevan, as well as several mineral springs and streams in the Khorasan provinces of Iran, belong to a single species (AFS, unpublished results). The oldest name available for that group is Theodoxus major Issel, 1865, described from Lake Sevan in Armenia (originally as variety of the unavailable name T. schirazensis). Akramovskiy (1976) noted the similarity of T. pallasi and T. major and considered the latter as a morphotype of the former. Although he did not explicitly state it, he thereby suggested the two taxa to be synonymous. This view was adopted by Vinarski and Kantor (2016), who listed major in synonymy of pallasi, although Issel's (1865) name has priority. The potential synonymy also involves T. schultzii. Despite the characteristic appearance of the syntypes, the presence of intermediate morphologies in samples taken on shores of Azerbaijan and Kazakhstan in 2016 and 2017 (pers. obs. OA, VA, FW) indicates a close relationship with T. pallasi. The radulae of these two species differ in the relative width of the central and marginal teeth (see Zettler 2007 and compare Anistratenko et al. 2017). Unfortunately, the types of T. major, supposed to be in the Museo Regionale di Scienze Naturali, Torino, are inaccessible at the moment due to museum renovation (E Gavetti, pers. comm., Oct 2018). We refrain from a final conclusion on the synonymy of the species involved until information on the types of all taxa as well as published molecular data are available. For details on the taxonomic relationship between T. pallasi and T. astrachanicus, see discussion in Anistratenko et al. (2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9171CCC870710181E43B950E6AA5C82A.taxon	conservation	Conservation status. Data Deficient (Van Damme and Kebapci 2014).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8F336C4D7B8DB31CCC9057262EBDDDF4.taxon	discussion	Status. Pontocaspian species, status uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8F336C4D7B8DB31CCC9057262EBDDDF4.taxon	distribution	Type locality. Caspian Sea, in two localities, given by Grimm (1877) as 43 ° 17 ' N, 01 ° 03 ' E, 40 fathoms, and 42 ° 48 ' N, 01 ° 22 ' E, 48 fathoms. Since the longitude was calculated relative to the geographic position of Baku, situated approximately at 50 E, the correct longitude should be about 51 ° 00 ' E (Vinarski and Kantor 2016). Distribution. Middle and southern Caspian Sea basins, between 15 and 100 m (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8F336C4D7B8DB31CCC9057262EBDDDF4.taxon	discussion	Taxonomic notes. See discussion of T. pallasi for notes on the potential synonymy with T. major Issel, 1865. The status of T. jukovi still requires confirmation (Vinarski and Kantor 2016).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8F336C4D7B8DB31CCC9057262EBDDDF4.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
741554A9923ED1D7FF9F2A26C8770AEF.taxon	discussion	Status. Pontocaspian species, name uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
741554A9923ED1D7FF9F2A26C8770AEF.taxon	distribution	Type locality. Dnieper Delta, Zbur'ivka liman, Ukraine. Distribution. This species was believed to be restricted to drainage systems of the northern Black Sea coast (even though the Oskol River lies far from the Black Sea coast), but unpublished molecular data suggest it may be distributed as far north as the eastern part of the Baltic Sea and as far south as Anatolia (AFS, unpublished data).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
741554A9923ED1D7FF9F2A26C8770AEF.taxon	discussion	Taxonomic notes. The species was listed as junior synonym of T. fluviatilis by Vinarski and Kantor (2016). Theodoxus velox is indeed challenging to differentiate from some regional morphotypes of that species given the overlap in shell patterns. Unpublished molecular data indicate however that T. velox belongs to a different molecular clade (AFS, unpublished data). The distribution range of that clade overlaps with the range of T. sarmaticus (Lindholm, 1901), which is widely accepted as a junior synonym of T. fluviatilis in the literature (e. g., Vinarski and Kantor 2016). A revision of the taxa involved and study of the type material is required to solve the synonymy issues.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
741554A9923ED1D7FF9F2A26C8770AEF.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
12D1DC28CA5101DB514CA818A2537862.taxon	discussion	Status. Accepted, native Pontocaspian or immigrant species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
12D1DC28CA5101DB514CA818A2537862.taxon	distribution	Type locality. Kaasjeswater, Zierikzee, the Netherlands. Distribution. Coastal areas of Europe and the Mediterranean region, extending to North Africa and east to Iran (Gloeer 2002). Occurrence in Black Sea according to, e. g., Chukhchin (1975) and in the Caspian Sea (TW, unpublished data).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
12D1DC28CA5101DB514CA818A2537862.taxon	discussion	Taxonomic notes. We find the attribution of this species to the genus Eupaludestrina unsatisfactory, yet a further revision is required to establish and stabilise the generic attribution as there is considerable confusion. It is commonly classified in the South American genus Heleobia (e. g., Prie 2011), whereas Kroll et al. (2012) suggested that this species belongs to the genus Semisalsa, a group of European Cochliopidae distinct from Heleobia. However, Semisalsa is currently listed as junior synonym of Eupaludestrina Mabille, 1877 (type species: Hydrobia macei Paladilhe, 1867, by subsequent designation by Kadolsky 2008). Following Kadolsky (2008), Eupaludestrina is currently ranked as subgenus of Heleobia in MolluscaBase (2018), but both the phylogenetic and geographic distinction of the European and American species suggest separation on the genus level. Remarks. It is unclear whether the species is native to the Pontocaspian area or a recent immigrant.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
12D1DC28CA5101DB514CA818A2537862.taxon	conservation	Conservation status. Least Concern (Prie 2011).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
74F5A65C021B13171AAD6909F1EE8CAC.taxon	discussion	Remarks. The Hydrobiidae form the most species-rich mollusc group in the Pontocaspian region. However, in general, useful shell characters are few and highly variable (Wilke and Delicado in press). Descriptions in the past have often been very general, and illustrations of types are notably poor for several of the endemic taxa. A strong tendency of naming large numbers of species has developed throughout the 20 th century (e. g., Logvinenko and Starobogatov 1969), but for some groups where morphological and genetic analyses could be performed (e. g., Caspiohydrobia spp.) it has been demonstrated that actual species numbers were much lower than the number of species described (Haase et al. 2010). For many of the endemic species, especially in the genus Turricaspia, the apparent loss of types, combined with the lack of living material makes it impossible to assess their taxonomic status. Currently, a number of taxonomic works is in progress on the endemic Pontocaspian hydrobiid groups, and some different insights on the genus-level classifications exist. Here, we adopt a conservative approach, mostly based on Neubauer et al. (2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8794A84A478EB114E15DC0C1EAA0087C.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8794A84A478EB114E15DC0C1EAA0087C.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Caspian Sea and possibly Danube Delta (Romania). This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia baerii).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8794A84A478EB114E15DC0C1EAA0087C.taxon	discussion	Taxonomic notes. The type material is stored in the von Baer collection of Caspian Sea molluscs in the Zoological Museum of Lviv University (Ukraine) and comprises more than a hundred syntypes (Anistratenko et al. 2018). The slender shell, the presence of a fine spiral keel below the suture, and the occasionally weakly reticulated surface distinguish this species from congeners.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8794A84A478EB114E15DC0C1EAA0087C.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
307865013EE22C85AA859BFD685F3553.taxon	discussion	Remarks. The distinction of the genera Caspia, Ulskia, and Clathrocaspia follows Neubauer et al. (2018). The three taxa are differentiated based on details of the protoconch and the expression of teleoconch sculpture. Caspia s. s. is characterised by a single distinct but fine spiral keel below the suture. It is usually smooth, yet within the type species some reticulate ornament can be found. Species of Clathrocaspia expose a distinctive, reticulate pattern on the teleoconch and a malleate protoconch with faint spiral threads. The aperture of Clathrocaspia often develops a distinct flat base. The discinction of the two genera is subject of current research. Ulskia also has a malleate protoconch but with more distinct spiral threads; teleoconch sculpture is occasionally present as minute elongate nodules.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
C7B6FA588C9A1C4CA36105FEEC80F116.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
C7B6FA588C9A1C4CA36105FEEC80F116.taxon	distribution	Type locality. Off Crimea, station 18, sample 173. Distribution. Endemic to the Black Sea Basin.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
C7B6FA588C9A1C4CA36105FEEC80F116.taxon	discussion	Taxonomic notes. The identity and status of this subfossil taxon, described from phaseoline silt, are somewhat uncertain. The holotype illustrated in Kantor and Sysoev (2006) is poorly preserved and does not allow a proper assessment of its validity. The general shape and size are indicative of the genus Caspia and it looks like a variety that might even be a synonym of C. baerii. Furthermore, we are not entirely certain as to the stratigraphic age of the stratigraphic origin of this species. The phaseoline silt is a marine Holocene unit, yet it contains reworked Late Pleistocene Neoeuxinian (Pontocaspian) species (FW, pers. obs.).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
C7B6FA588C9A1C4CA36105FEEC80F116.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4F4CA0745ECD6EBAB97A85C77FA755E9.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4F4CA0745ECD6EBAB97A85C77FA755E9.taxon	distribution	Type locality. Caspian Sea shores of Dagestan, Russia, at ca. 60 m. Distribution. Presently endemic to the Caspian Sea. The species was also recorded from the Holocene of Danube Delta, Ukraine (Anistratenko and Prisyazhniuk 1992).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4F4CA0745ECD6EBAB97A85C77FA755E9.taxon	discussion	Taxonomic notes. The species differs from its congeners in the bulbous shape, with a ratio of body whorl height / shell height of approx. 3 / 4, as well as regarding the expanded aperture.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4F4CA0745ECD6EBAB97A85C77FA755E9.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
EF88D64C4673CC11025BC68BA17DBB15.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
EF88D64C4673CC11025BC68BA17DBB15.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea, recorded from the middle and southern parts. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia gmelinii).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
EF88D64C4673CC11025BC68BA17DBB15.taxon	discussion	Taxonomic notes. The broad shell and the heavily reticulated surface distinguish this species from congeners. Pyrgula sowinskyi, from the middle and southern Caspian Sea, and P. gaillardi, from the Caspian Sea shore between Astara and Hashtpar (= Talesh), Iran, closely resemble C. gmelinii in terms of shell shape, the shape of the aperture, and the distinct reticulate teleoconch sculpture. Very likely, the two species are synonyms of C. gmelini. Since the type material of Logvinenko and Starobogatov (1969) has not been found, and the whereabouts of the material of Tadjalli-Pour (1977) is unknown, a re-examination of these species has to be postponed. Here, we suggest to treat them as nomina dubia until more information becomes available.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
EF88D64C4673CC11025BC68BA17DBB15.taxon	conservation	Conservation status. Data Deficient (same for P. sowinskyi; Son 2011 a, Vinarski 2011 o).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
312531DD957992B199B32FD4E681A742.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
312531DD957992B199B32FD4E681A742.taxon	distribution	Type locality. Southern Caspian Sea (no details), between 40 - 75 m water depth. Distribution. Endemic to the Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
312531DD957992B199B32FD4E681A742.taxon	discussion	Taxonomic notes. This species hardly differs from C. pallasii and might be a junior synonym. Observations on Holocene material from the southern and northern Caspian Sea shores (VA, TN, FW) suggest that the minor differences range within intraspecific variability but further studies (preferentially involving DNA) are required to solve the identity of this taxon. The classification in Clathrocaspia is based on the reticulate sculpture typical of that genus.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
312531DD957992B199B32FD4E681A742.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 j).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
137F49F77908B1976FF0013D2FC9A739.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
137F49F77908B1976FF0013D2FC9A739.taxon	distribution	Type locality. Ukraine, in the Dniester River (exact locality not specified). Distribution. Azov Sea and northern Black Sea Basin. Known from the Holocene of Danube Delta, Ukraine (Anistratenko and Prisyazhniuk 1992).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
137F49F77908B1976FF0013D2FC9A739.taxon	discussion	Taxonomic notes. Clathrocaspia knipowitschii, C. makarovi, C. gmelini aluschtensis, and C. stanislavi were all described from the northern margin of the Black Sea. After detailed morphological comparison of C. knipowitschii and C. makarovi syn. n. and preliminary genetic analyses (TW, unpublished data), we conclude that both taxa should be considered synonyms. Very likely, also C. gmelini aluschtensis and C. stanislavi are synonyms of C. knipowitschii, but a final decision on that matter requires investigation of the type material.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
137F49F77908B1976FF0013D2FC9A739.taxon	conservation	Conservation status. Least Concern (same for C. makarovi; Son 2011 b, c).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B5944C7F018DE6E8E952E1782DB043A7.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B5944C7F018DE6E8E952E1782DB043A7.taxon	distribution	Type locality. Don Delta, Russia. Distribution. Known only from the type locality.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B5944C7F018DE6E8E952E1782DB043A7.taxon	discussion	Taxonomic notes. The species has distinctive shell characters: broad conical shape with a weak subsutural bulge and apically thickened peristome. Remarks. The type material was collected by Mordukhay-Boltovskoy in 1937 and comprises two specimens, the holotype and the paratype. Three additional specimens were collected from the same region in 2006 (Anistratenko 2007 a). The salinity at the type locality ﬂuctuates between freshwater and ca. 1 ‰.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B5944C7F018DE6E8E952E1782DB043A7.taxon	conservation	Conservation status. Not assessed. In the fifty years since the description of this species five specimens have been collected; this is likely evidence of its rarity. Known only from two close localities, C. logvinenkoi appears to have an extremely narrow distributional range in the Azov-Black Sea Basin, being endemic to the Taganrog province (e. g., Anistratenko 2007 a).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F8BEECE4D23EDE957F334A7710F69E2A.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F8BEECE4D23EDE957F334A7710F69E2A.taxon	distribution	Type locality. Bulgaria, Danube Island Vardim (43 ° 37 ' N, 25 ° 28 ' E). Distribution. Only known from type locality.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F8BEECE4D23EDE957F334A7710F69E2A.taxon	discussion	Taxonomic notes. This species closely resembles C. knipowitschii concerning shape, size, and sculpture. According to Boeters et al. (2015), the two species differ in the degree of cover of the umbilicus, the shape of the peristome and the size and number of whorls of the protoconch. Molecular and / or more in-depth morphological and anatomical studies are required to confirm that these apparently minor differences are sufficient to separate the species. Remarks. If the species would be confirmed, it concerns a Pontocaspian species whose distribution currently is outside prime Pontocaspian habitat, yet Boeters et al. (2015) implied they would expect that several of the Caspia records from the lower Danube and Razim Lake complex might be attributed to C. milae as well. The Razim Lake complex is Pontocaspian habitat.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F8BEECE4D23EDE957F334A7710F69E2A.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
953BF6606B97DDD10ABAEEEBF1D33414.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
953BF6606B97DDD10ABAEEEBF1D33414.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
953BF6606B97DDD10ABAEEEBF1D33414.taxon	discussion	Taxonomic notes. This species differs from the other Caspian species C. gmelinii in its very slender shape.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
953BF6606B97DDD10ABAEEEBF1D33414.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
48C7D9004E54C5585471B4B822C0F65B.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
48C7D9004E54C5585471B4B822C0F65B.taxon	distribution	Type locality. Western part of the southern Caspian Sea, in the vicinity of the Kura River mouth, 39 ° 05 ' N, 49 ° 48 ' E, 120 m. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
48C7D9004E54C5585471B4B822C0F65B.taxon	discussion	Taxonomic notes. The drawings provided by Logvinenko and Starobogatov (1969) sketch a broad and conical shell. As such, it differs from the more elongate and ovoid Ulskia ulskii (Neubauer et al. 2018). A revision is required to clarify its taxonomic status.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
48C7D9004E54C5585471B4B822C0F65B.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 f).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFF5BB9586E1B9B1C067071BDAF07FB9.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFF5BB9586E1B9B1C067071BDAF07FB9.taxon	distribution	Type locality. Middle and southern Caspian Sea, 45 - 81 m. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFF5BB9586E1B9B1C067071BDAF07FB9.taxon	discussion	Taxonomic notes. The species differs from U. ulskii and U. behningi in the very slender elongate shape and the presence of a subsutural band; this suggests P. derzhavini might be likely a member of Caspia s. s. A revision is required to clarify its taxonomic status and generic placement.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFF5BB9586E1B9B1C067071BDAF07FB9.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9AFCF7F38B5BADFE72D5129962CAB2F1.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9AFCF7F38B5BADFE72D5129962CAB2F1.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Western part of the Caspian Sea. This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia ulskii, T. schorgyni, and T. nana).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9AFCF7F38B5BADFE72D5129962CAB2F1.taxon	discussion	Taxonomic notes. This species was recently studied by Neubauer et al. (2018), who considered P. nana and P. schorygini as its junior synonyms.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9AFCF7F38B5BADFE72D5129962CAB2F1.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35F8A6F7240E293E7A0D028A43F3857D.taxon	discussion	Status. Accepted native Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35F8A6F7240E293E7A0D028A43F3857D.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Caspian Sea; Aral Sea; salt lakes near Chelyabinsk, Russia (Shishkoedova 2010); Lake Sawa, Iraq (Haase et al. 2010); Arabian (Persian) Gulf (Gloeer and Pesic 2012); possibly also northern and central Kazakhstan and Tajikistan (Vinarski and Kantor 2016), however, no molecular data are known to confirm the identity of the Central Asian snails. This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Caspiohydrobia curta and C. gemma).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35F8A6F7240E293E7A0D028A43F3857D.taxon	discussion	Taxonomic notes. Most of the species that have been assigned to the genus Caspiohydrobia Starobogatov, 1970, including its type species, Pyrgohydrobia eichwaldiana Golikov & Starobogatov, 1966, range within the morphological variability of E. grimmi. Previous examination of some Caspiohydrobia juvenile shells (Filippov and Riedel 2009, Anistratenko 2013, fig. 4 A-C) as well as reproductive systems and radula did not find any criteria to support differentiation. Probably, all of the thirty Caspiohydrobia species listed by Kantor and Sysoev (2006) and Vinarski and Kantor (2016) for the Caspian Sea are morphotypes of a single species. Prelimary genetic analyses of Caspiohydrobia spp. from salt lakes near Chelyabinsk, Russia (TW, unpublished data) support this assumption.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35F8A6F7240E293E7A0D028A43F3857D.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 b).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
77206A3AB87762FC1577F3EA32D874AC.taxon	discussion	Remarks. In addition to the taxa discussed below, the following species of Hydrobiinae have been mentioned from the Black Sea basin (updated statuses after MolluscaBase 2018 a): Hydrobia aciculina (Bourguignat, 1876), H. acuta (Draparnaud, 1805), H. euryomphala (Bourguignat, 1876), H. mabilli (Bourguignat, 1876) [currently accepted as Peringia mabilli], H. macei Paladilhe, 1867 [currently accepted as Heleobia macei], H. procerula (Paladilhe, 1869) [currently considered a synonym of H. acuta] (Anistratenko et al. 2011). These species were described from the Western Mediterranean and their occurrence in the Black Sea region requires re-investigation; partly the records might be misidentifications of the species of Ecrobia listed below or Eupaludestrina (Cochliopidae) listed above.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D431FF65EE0EDAD1B2B1269D25B3B9E9.taxon	discussion	Status. Accepted, Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D431FF65EE0EDAD1B2B1269D25B3B9E9.taxon	distribution	Type locality. Black Sea, at Feodosiya and Adler (Crimea, Ukraine). Distribution. Black Sea Basin; northern Aegean Sea; Lake Sarikum, Turkey; northern Adriatic Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D431FF65EE0EDAD1B2B1269D25B3B9E9.taxon	discussion	Taxonomic notes. Hydrobia pontieuxini, described from the Black Sea coast in Mangalia, Romania, has been considered a synonym of E. maritima based on molecular data (Kevrekidis et al. 2005). Herein, we also consider the Pseudopaludinella species introduced by Anistratenko and Prisyazhniuk (1992) as junior synonyms of E. maritima based on morphological similarities. A proper revision is still pending.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
D431FF65EE0EDAD1B2B1269D25B3B9E9.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0199361EB30F0DCBDCF899404E57EF88.taxon	discussion	Status. Accepted, immigrant species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0199361EB30F0DCBDCF899404E57EF88.taxon	distribution	Type locality. On the Kent coast (United Kingdom), at Folkstone and Sandwich. Distribution. Widespread along the coastal zones of northern and western Europe, the Mediterranean Sea, the Russia White Sea; introduced into the western Black Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0199361EB30F0DCBDCF899404E57EF88.taxon	discussion	Taxonomic notes. Unpublished genetic data (TW) suggest that most previous records of E. ventrosa in the Black Sea are likely misidentifications of E. grimmi. A notable exception is a recent, genetically confirmed record from Constanța, Romania (Osikowski et al. 2016). Probably, the French species Paludestrina arenarum Bourguignat, 1876, P. leneumicra Bourguignat, 1876, P. paludinelliformis Bourguignat, 1876, and Ventrosia cissana Radoman, 1977, which have been listed for the Black Sea Basin (Anistratenko 1991, Anistratenko and Prisyazhniuk 1992, Anistratenko et al. 2011), are junior synonyms or misidentifications of this species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0199361EB30F0DCBDCF899404E57EF88.taxon	conservation	Conservation status. Least Concern (Van Damme 2011 a).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5484EA0045D8767FC91285897DB427A7.taxon	discussion	Remarks. The genus concepts of Pontocaspian Pyrgulinae follow the revision of Neubauer et al. (2018). Further change is expected in several of the keeled species here listed under? Turricaspia (? T. aenigma,? T. basalis,? T. dimidiata,? T. pseudobacuana, and? T. pseudodimiata) that may be grouped in their own genus for which the name Trachycaspia Dybowski & Grochmalicki, 1917 (type species: Rissoa dimidiata Eichwald, 1838) is available. However, such a decision will require further documentation.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
62DD080E5F88CD46DA53BFCEFAED20F2.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
62DD080E5F88CD46DA53BFCEFAED20F2.taxon	distribution	Type locality. At the Volga River mouth near Astrakhan, and towards the Caspian Sea; also in recently lithified fossil limestone at the shores of Dagestan, Russia. Distribution. Caspian Sea, Azov Sea, and northern Black Sea region. This species was mentioned in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia variabilis, T. derbentica, and T. trivialis).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
62DD080E5F88CD46DA53BFCEFAED20F2.taxon	discussion	Taxonomic notes. Neubauer et al. (2018) recently demonstrated the high variability of this species. Comparison of available illustrations and descriptions of the species listed in the synonymy list indicates that all of them range within this species' variability. Consequently, we consider all of them as junior synonyms of C. variabilis. A more in-depth review of the type material of the species involved is required to confirm this approach. The status of Paludina bogensis Dubois in Kuester, 1852, which was listed as a valid species of Turricaspia by Anistratenko and Stadnichenko (1995), is still unclear. That species was described from the Zapadnyi Bug River in Poland and closely resembles C. variabilis. It is, however, unlikely that a Pontocaspian species typical of oligohaline conditions occurs so far away in a pure freshwater environment. " Paludina eichwaldi Krynicki, 1837 " found in the literature is a nomen nudum. Martens (1874) provided measurements and made the name available, but he listed Paludina variabilis Eichwald, 1838 in synonymy, which has priority. Dybowski (1887) obviously overlooked this and considered Nematurella eichwaldi Krynicki a valid species. We follow Vinarski and Kantor (2016) and consider the species as a junior synonym of Clessiniola variabilis.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
62DD080E5F88CD46DA53BFCEFAED20F2.taxon	conservation	Conservation status. Least Concern (Cioboiu et al. 2011).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
437808A388345126FAE12FE6EAE9A30A.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
437808A388345126FAE12FE6EAE9A30A.taxon	distribution	Type locality. Southern and western parts of the Middle Caspian Sea, 36 - 120 m. Distribution. Middle and South Caspian Basin. This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia abichi).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
437808A388345126FAE12FE6EAE9A30A.taxon	discussion	Taxonomic notes. The species differs from the L. cincta in its much larger size, the conical shape, the narrower subsutural band, and the larger aperture (compare Neubauer et al. 2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
437808A388345126FAE12FE6EAE9A30A.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 e).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FA775730142F2DC6406F9A82FBD47029.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FA775730142F2DC6406F9A82FBD47029.taxon	distribution	Type locality. In fossil limestone of Dagestan, Russia. Distribution. Endemic to the Caspian Sea. This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia caspia and T. curta).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FA775730142F2DC6406F9A82FBD47029.taxon	discussion	Taxonomic notes. For a detailed discussion about the identity of this species, its synonyms and former misidentifications, see Neubauer et al. (2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FA775730142F2DC6406F9A82FBD47029.taxon	conservation	Conservation status. IUCN indicates " Least Concern " (Vinarski 2012), but the true status of this species is highly uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1BCB075CB448A069EC422CE228337A1A.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1BCB075CB448A069EC422CE228337A1A.taxon	distribution	Type locality. Gulf of Baku, Azerbaijan. Distribution. Southern Caspian Sea (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1BCB075CB448A069EC422CE228337A1A.taxon	discussion	Taxonomic notes. For a detailed discussion about the identity of this species and its synonym, see Neubauer et al. (2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1BCB075CB448A069EC422CE228337A1A.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 g).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7F32E552C1B3B4F4C4E88D6762368931.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7F32E552C1B3B4F4C4E88D6762368931.taxon	distribution	Type locality. In fossil limestone of Dagestan, Russia. Distribution. Endemic to the Caspian Sea (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia conus).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7F32E552C1B3B4F4C4E88D6762368931.taxon	discussion	Taxonomic notes. For a detailed discussion about the identity of this polymorphic species and previous misidentifications, see Neubauer et al. (2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7F32E552C1B3B4F4C4E88D6762368931.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 p).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3939026E2077D92F64543AE18E66FD19.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3939026E2077D92F64543AE18E66FD19.taxon	distribution	Type locality. Western part of the middle Caspian Sea, 0 - 50 m water depth. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3939026E2077D92F64543AE18E66FD19.taxon	discussion	Taxonomic notes. We cannot verify the status of this species given the inadequate descriptions and illustrations and its general resemblance to other species that were described earlier.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
3939026E2077D92F64543AE18E66FD19.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 h).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2D121AC04D8251BCF95EB38452DBB083.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2D121AC04D8251BCF95EB38452DBB083.taxon	distribution	Type locality. Ukraine, Danube Delta, lakes Yalpug and Kugurlui. Distribution. North-western Black Sea Basin (Anistratenko and Stadnichenko 1995).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2D121AC04D8251BCF95EB38452DBB083.taxon	discussion	Taxonomic notes. Based on the illustration of the holotype in Kantor and Sysoev (2006), we tentatively place the species in the genus Laevicaspia. A more detailed study is necessary to clarify its systematic position.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2D121AC04D8251BCF95EB38452DBB083.taxon	conservation	Conservation status. Vulnerable (Son and Cioboiu 2011).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
736292FEEFC6D18327C733F4E687522C.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
736292FEEFC6D18327C733F4E687522C.taxon	distribution	Type locality. Caspian Sea, northward of Apsheron Peninsula, north-westward from Kamni Dva Brata Island, 40 ° 47 ' N, 49 ° 42 ' E, 30 m water depth. Distribution. Endemic to the Caspian Sea. This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia kolesnikoviana).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
736292FEEFC6D18327C733F4E687522C.taxon	discussion	Taxonomic notes. For a detailed discussion about the identity of this species, see Neubauer et al. (2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
736292FEEFC6D18327C733F4E687522C.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 k).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
823A59D20E01118E2639DDCC3A57B6B9.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
823A59D20E01118E2639DDCC3A57B6B9.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Caspian Sea, recorded from southern basin (Logvinenko and Starobogatov 1969) and middle basin (personal observation based on material from Dagestan region, TAN, FW). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia kowalewskii).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
823A59D20E01118E2639DDCC3A57B6B9.taxon	discussion	Taxonomic notes. This species differs from L. kolesnikoviana in its bigger size, broader shape, and thinner peristome. Laevicaspia cincta can be distinguished based on the stouter shape and the presence of a narrow subsutural band.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
823A59D20E01118E2639DDCC3A57B6B9.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7AF2AABDDD1A4C7FF604BC878C2CC053.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7AF2AABDDD1A4C7FF604BC878C2CC053.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Caspian Sea (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7AF2AABDDD1A4C7FF604BC878C2CC053.taxon	discussion	Taxonomic notes. Based on the illustrations provided in Kantor and Sysoev (2006), this species differs from L. cincta and L. kowalewskii in the conical shape and large body whorl. A revision is required to assure its status as distinct species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7AF2AABDDD1A4C7FF604BC878C2CC053.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42968BE4F51FEE38946A6EC3B1E57A17.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42968BE4F51FEE38946A6EC3B1E57A17.taxon	distribution	Type locality. Kotlabukh Lake, Odessa Region, Ukraine (approximately 45 ° 25 ' 35 " N, 28 ° 59 ' 41 " E). Distribution. Limans and lower reaches of rivers Don, Dnieper, Dniester, and Southern Bug entering the northern Black Sea Basin and the Azov Sea (Taganrog Bay), as well as in coastal lakes Kotlabukh and Yalpug (Vinarski and Kantor 2016). The record of an undescribed subspecies of T. boltovskoji from the Caspian Sea mentioned by Anistratenko and Stadnichenko (1995) is probably based on a misidentification.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42968BE4F51FEE38946A6EC3B1E57A17.taxon	discussion	Taxonomic notes. Golikov and Starobogatov (1966) and Alexenko and Starobogatov (1987) introduced a plethora of names for morphologically similar species from the northern Black Sea Basin, partly deriving from subfossil horizons. They differ from Laevicaspia lincta slightly in the number of whorls and outline shape, but overall range within its morphological variability. Here, we consider them tentatively all junior synonyms of L. lincta. Since Starobogatov's type material is unknown, support for this approach requires collection of new material from the type localities of these taxa. Molecular data confirmed the conspecifity of L. lincta and L. milachevitchi (Wilke et al. 2007).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42968BE4F51FEE38946A6EC3B1E57A17.taxon	conservation	Conservation status. Least Concern (Son 2011 e).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
120EE37E9D649D4D51D13136310CEEB7.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
120EE37E9D649D4D51D13136310CEEB7.taxon	distribution	Type locality. Caspian Sea, " near Krasnojarsk " (Westerlund 1902 a). This statement is clearly erroneous since Krasnojarsk is situated in Siberia. Most probably, Westerlund meant Krasnovodsk (nowadays Turkmenbashi) in Turkmenistan (Vinarski et al. 2013). Distribution. Endemic to the Caspian Sea. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia marginata).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
120EE37E9D649D4D51D13136310CEEB7.taxon	discussion	Taxonomic notes. The status of this species is uncertain. The illustrations of the type material by Vinarski et al. (2013) suggest a tentative placement in the genus Laevicaspia. It shows close similarities with L. sieversii (Clessin in Dybowski, 1887). A careful revision of the species is required to clarify its taxonomic status and systematic placement.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
120EE37E9D649D4D51D13136310CEEB7.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FB4C2CCFCA4C01540F31A7D285DC12E2.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FB4C2CCFCA4C01540F31A7D285DC12E2.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FB4C2CCFCA4C01540F31A7D285DC12E2.taxon	discussion	Taxonomic notes. This species has not been found since its first description, its identity is unclear (Vinarski and Kantor 2016). Judging from the description and drawing in Dybowski (1887), we suggest a systematic placement in Laevicaspia. It might be related to L. conus (Eichwald, 1838).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FB4C2CCFCA4C01540F31A7D285DC12E2.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
790627C759A84E3EFE7B08EAD2A5D551.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
790627C759A84E3EFE7B08EAD2A5D551.taxon	distribution	Type locality. Caspian Sea, northward of Apsheron Peninsula, 75 m. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
790627C759A84E3EFE7B08EAD2A5D551.taxon	discussion	Taxonomic notes. The identity of this species is unclear. The illustrations of the holotype in Kantor and Sysoev (2006) show a small shell with four whorls, of which the latter two bear a distinct keel. The small size and the relatively large protoconch suggest that the type specimen is a juvenile shell. More specimens (including adult material) are required to shed light on this species' identity.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
790627C759A84E3EFE7B08EAD2A5D551.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7EEB59CF14D6AA40A6EC3D5C8ED0078E.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7EEB59CF14D6AA40A6EC3D5C8ED0078E.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea. The two tentative synonyms were recorded from the western part of the middle Caspian Sea and the eastern part of the southern Caspian Sea, respectively. This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as T. turkmenica, T. dubia, and T. andrussowi).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7EEB59CF14D6AA40A6EC3D5C8ED0078E.taxon	discussion	Taxonomic notes. The species was recently investigated by Neubauer et al. (2018). Pyrgula dubia and P. turkmenica are tentatively considered juveniles and thus junior synonyms of this species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
7EEB59CF14D6AA40A6EC3D5C8ED0078E.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A844D94D01EDF8F35A7F2017B30C5BDA.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A844D94D01EDF8F35A7F2017B30C5BDA.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Middle and southern Caspian Sea (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as T. laticarinata).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A844D94D01EDF8F35A7F2017B30C5BDA.taxon	discussion	Taxonomic notes. The species is characterised by a massive keel near the lower suture.? Turricaspia dimidiata is distinguished based on its more centrally placed keel. This distinction is tentative and only based on comparison of available illustrations; we are aware of the possibility that these differences might not be diagnostic. Moreover, the keel seems to become stronger with increasing water depth (Starobogatov 1968). Pyrgula laticarinata Logvinenko & Starobogatov, 1969, which differs from T. basalis only in the strength of the keels, was considered a junior synonym by Neubauer et al. (2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A844D94D01EDF8F35A7F2017B30C5BDA.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1368A8DF97AE73BCFDE446754E5425BC.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1368A8DF97AE73BCFDE446754E5425BC.taxon	distribution	Type locality. Western part of the Caspian Sea. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1368A8DF97AE73BCFDE446754E5425BC.taxon	discussion	Taxonomic notes. The description and drawing of this species provided by Logvinenko and Starobogatov (1969) do not allow an evaluation whether it is a distinct species or synonym of a previously species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1368A8DF97AE73BCFDE446754E5425BC.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
308CDA6E7A11BC9D00C2A23D65E7E41E.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
308CDA6E7A11BC9D00C2A23D65E7E41E.taxon	distribution	Type locality. Ukraine, in the Dnieper Delta. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
308CDA6E7A11BC9D00C2A23D65E7E41E.taxon	discussion	Taxonomic notes. The status of this species is highly uncertain. The slender conical shell illustrated by Alexenko and Starobogatov (1987) suggest classification in the genus Turricaspia, which is otherwise only known from the Caspian Sea.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
308CDA6E7A11BC9D00C2A23D65E7E41E.taxon	conservation	Conservation status. Data Deficient (Son 2011 d).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4ACECD867F8BC609A823DD5C805FDD13.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4ACECD867F8BC609A823DD5C805FDD13.taxon	distribution	Type locality. Western part of the southern Caspian Sea. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4ACECD867F8BC609A823DD5C805FDD13.taxon	discussion	Taxonomic notes. The species has not been found since its first description, and the whereabouts of the type material is unknown. Logvinenko and Starobogatov (1969) illustrate a small slender shell with convex whorls. It might well be a juvenile of another species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4ACECD867F8BC609A823DD5C805FDD13.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DA741F98E180FF4C59448691427D3C96.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DA741F98E180FF4C59448691427D3C96.taxon	distribution	Type locality. Middle Caspian Sea, 25 - 80 m. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DA741F98E180FF4C59448691427D3C96.taxon	discussion	Taxonomic notes. The illustrations provided by Logvinenko and Starobogatov (1969) indicate a large conical shell with nine convex whorls and a large, slightly inflated last whorl. These features are reminiscent of T. meneghiniana (Issel, 1865). However, T. concinna has not been found since its first description. The type material has been very recently detected in the collections of ZIN and awaits further study.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DA741F98E180FF4C59448691427D3C96.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFC9501CA46FB2AB674705A2125638E6.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFC9501CA46FB2AB674705A2125638E6.taxon	distribution	Type locality. Western shore of the middle Caspian Sea. Distribution. Middle and south Basin of Caspian Sea. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFC9501CA46FB2AB674705A2125638E6.taxon	discussion	Taxonomic notes. The status of this species is highly uncertain. The illustrations of Logvinenko and Starobogatov (1969) show a slightly distorted shell with weakly convex whorls and a thin line below the suture. We are uncertain whether it might concern a growth aberration of a more common species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFC9501CA46FB2AB674705A2125638E6.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 r).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5E24ADA876CD67560259D4E1CBF9B859.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5E24ADA876CD67560259D4E1CBF9B859.taxon	distribution	Type locality. In fossil limestone of Dagestan, Russia. Distribution. Middle and southern Caspian Sea (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5E24ADA876CD67560259D4E1CBF9B859.taxon	discussion	Taxonomic notes. Although there is little doubt about the validity of this species, its true identity and possible synonyms are unclear. Eichwald's (1838) description clearly indicates a slender shell with median keel. His type material is unfortunately unknown. The high number of keeled species complicates an evaluation what is the " true " T. dimidiata and what are synonyms. We tentatively consider Turricaspia bakuana Kolesnikov, 1947 a junior synonym of this species, based on its slender shell with median keel matching Eichwald's description as well as the prevailing concept of T. dimidiata (compare Kantor and Sysoev 2006). More data are required to support this view.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5E24ADA876CD67560259D4E1CBF9B859.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2EDEDC827F9C66B64B64AD0530BCD5B2.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2EDEDC827F9C66B64B64AD0530BCD5B2.taxon	distribution	Type locality. Eastern part of the southern Caspian Sea. Distribution. South Caspian Basin. This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2EDEDC827F9C66B64B64AD0530BCD5B2.taxon	discussion	Taxonomic notes. The identity of this species is unclear. Its shell resembles T. lyrata (Dybowski & Grochmalicki, 1915) in terms of general shape and the large, flat protoconch; it differs from that species in the large size. The type material has been very recently found in the collection of ZIN and awaits further study. Until then, we refrain from a final decision on the species' status, but we have severe doubt that Pyrgula eburnea is a distinct species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2EDEDC827F9C66B64B64AD0530BCD5B2.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CC5E2A39D83639D13B6527ABE0C56968.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CC5E2A39D83639D13B6527ABE0C56968.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CC5E2A39D83639D13B6527ABE0C56968.taxon	discussion	Taxonomic notes. There is considerable confusion about the identity of this species. Dybowski (1887) described and illustrated a very slender shell with a distinct whorl profile showing a straight-sided upper half and a convex lower half. In contrast, the illustrations in Logvinenko and Starobogatov (1969) suggest a similarly slender yet distorted shell with near almost sided whorls and expanded aperture. A restudy of the type material of T. elegantula show close similarities to T. spica. It differs from that species in the more slender outline and flattened whorls.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CC5E2A39D83639D13B6527ABE0C56968.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A578ED4CB6DE10B101DFDC025C806F6C.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A578ED4CB6DE10B101DFDC025C806F6C.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Middle Caspian Sea Basin (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A578ED4CB6DE10B101DFDC025C806F6C.taxon	discussion	Taxonomic notes. The nearly straight-sided, strongly attached whorls easily distinguish this species from most other Turricaspia species. Only Turricaspia grimmi (Clessin & Dybowski in Dybowski, 1887) has a similar whorl arrangement, but its shell is slightly wider and the whorls are weakly stepped and bear a thin subsutural band.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
A578ED4CB6DE10B101DFDC025C806F6C.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
81C462ECA2018B20BA212069C211BA46.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
81C462ECA2018B20BA212069C211BA46.taxon	distribution	Type locality. Western part of the middle Caspian Sea, 80 m. Distribution. Middle and South Caspian Basin. This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
81C462ECA2018B20BA212069C211BA46.taxon	discussion	Taxonomic notes. The slender elongate shell with whorls slowly increasing in height distinguishes this species from its congeners. However, a proper assessment of the species' status requires investigation. The whereabouts of the type material is unknown and no other records of this species are known, so we are not able to verify the status of this species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
81C462ECA2018B20BA212069C211BA46.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFAFD85F5E444711DB516B18B8FAE5AB.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFAFD85F5E444711DB516B18B8FAE5AB.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Southern Caspian Sea Basin (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFAFD85F5E444711DB516B18B8FAE5AB.taxon	discussion	Taxonomic notes. The peculiar morphology with straight-sided, weakly stepped whorls with a thin subsutural band is unique among Caspian Pyrgulinae. See above for a comparison with T. eulimellula.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BFAFD85F5E444711DB516B18B8FAE5AB.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 i).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BD65709CABC6EE969360C30A447CE3E5.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BD65709CABC6EE969360C30A447CE3E5.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea (after Logvinenko and Starobogatov 1969); it occurs in the western part of the middle and southern Caspian Sea basins, but these authors used a slightly different concept of the species. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Turricaspia lirata).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BD65709CABC6EE969360C30A447CE3E5.taxon	discussion	Taxonomic notes. See Neubauer et al. (2018) for a detailed discussion of the species and its synonyms.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
BD65709CABC6EE969360C30A447CE3E5.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2DDA820A51373C405173D1C3037CD29C.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2DDA820A51373C405173D1C3037CD29C.taxon	distribution	Type locality. " Meotida " station 24, sample 229, near the coast of Crimea, in phaseoline silt (Holocene). Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2DDA820A51373C405173D1C3037CD29C.taxon	discussion	Taxonomic notes. The species can be distinguished based on its extremely slender shell with whorls slowly increasing in size. Still, clarification of its identity as well as its generic classification requires investigation of additional material.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2DDA820A51373C405173D1C3037CD29C.taxon	conservation	Conservation status. So far only known from Holocene deposits of the type locality; species might be extinct. Within Holocene deposits in the Black Sea small amounts of reworked Late Pleistocene " Neoeuxinian " faunas are found (FW, pers. obs.), and therefore the stratigraphic origin of such Pontocaspian species is uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
338E5B95659C922D2056EDABBADBFCED.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
338E5B95659C922D2056EDABBADBFCED.taxon	distribution	Type locality. Baku, Azerbaijan; (sub?) fossil. Distribution. Middle and southern Caspian Sea (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
338E5B95659C922D2056EDABBADBFCED.taxon	discussion	Taxonomic notes. The species was recently discussed in detail by Neubauer et al. (2018), who also discussed previous misidentifications.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
338E5B95659C922D2056EDABBADBFCED.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FADD3B8543F84D421605E423E59811D3.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FADD3B8543F84D421605E423E59811D3.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Southern Caspian Sea (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FADD3B8543F84D421605E423E59811D3.taxon	discussion	Taxonomic notes. The very slender shape and the characteristic, highly convex whorls that slowly and regularly increase in height distinguish the species from most congeners. Pyrgula vinogradovi Logvinenko & Starobogatov, 1969 and P. astrachanica Pirogov, 1971, which show very similar traits, might be junior synonyms. A more in-depth study is required to solve their statuses.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
FADD3B8543F84D421605E423E59811D3.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 l).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35E065AC1624F34A096861786C2E9F50.taxon	discussion	Status. Uncertain Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35E065AC1624F34A096861786C2E9F50.taxon	distribution	Type locality. Well 37 near Kiliya, Izmail district, Odessa region, Ukraine (from Holocene sediments). Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35E065AC1624F34A096861786C2E9F50.taxon	discussion	Taxonomic notes. This species was originally attributed to the genus Caspia due to its small shell. A study of the holotype of this species, specifically its protoconch characteristics, suggest placement in the genus Turricaspia. Further studies are required to assure its validity. Remarks. The species is known only from the holotype. The occurrence of Turricaspia in the Black Sea Basin is unusual, as almost all other pyrguline Black Sea species are assigned to the genus Laevicaspia (but see remark at T. spica for another unusual occurrence).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
35E065AC1624F34A096861786C2E9F50.taxon	conservation	Conservation status. So far only known from Holocene deposits of the type locality; species might be extinct.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4C4591F26E83B7E6F3C1946392FDD3E5.taxon	discussion	Status. Pontocaspian species, probably junior synonym.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4C4591F26E83B7E6F3C1946392FDD3E5.taxon	distribution	Type locality. Southern Caspian Sea, 50 - 80 m. Distribution. South Caspian Basin. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4C4591F26E83B7E6F3C1946392FDD3E5.taxon	discussion	Taxonomic notes. The slender shell with a keel near the lower suture is reminiscent of T. basalis (Dybowski & Grochmalicki, 1915). The short description and poor drawing precluded the verification of its status. The type material has been very recently detected in the collection of ZIN and awaits further study.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4C4591F26E83B7E6F3C1946392FDD3E5.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
49A35F56FA7E99A2DF7B11C8A5B36135.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
49A35F56FA7E99A2DF7B11C8A5B36135.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Southern Caspian Sea (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
49A35F56FA7E99A2DF7B11C8A5B36135.taxon	discussion	Taxonomic notes. The identity of this species is uncertain. Dybowski and Grochmalicki (1915) describe and illustrate a shell with eight convex whorls bearing a weak, hardly protruding, irregular shaped keel near the lower suture. According to these authors, the keel varies considerably between a thin thread, a blunt bulge, or a weak thickening at the suture. In contrast, the drawings provided by Logvinenko and Starobogatov (1969) and reproduced by Kantor and Sysoev (2006) suggest a shell with straight-sided whorls and a distinct keel. Inspection of the type material is required to clarify the status of this species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
49A35F56FA7E99A2DF7B11C8A5B36135.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
951E12CEF1CF858E0A4A0CC7E4021BE7.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
951E12CEF1CF858E0A4A0CC7E4021BE7.taxon	distribution	Type locality. Middle and southern Caspian Sea, 15 - 75 m. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
951E12CEF1CF858E0A4A0CC7E4021BE7.taxon	discussion	Taxonomic notes. The identity of this species is unclear. Judging from the drawing by Logvinenko and Starobogatov (1969), showing a small slender shell with ca. 6.5 convex whorls, the species might be based on a juvenile specimen. Moreover, it could be a junior synonym of the similarly shaped T. spica (Eichwald, 1855).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
951E12CEF1CF858E0A4A0CC7E4021BE7.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
456BACB889218529ECCEAE6BBA1E9E37.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
456BACB889218529ECCEAE6BBA1E9E37.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea, reported from the middle and southern Caspian Sea basins (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
456BACB889218529ECCEAE6BBA1E9E37.taxon	discussion	Taxonomic notes. The species can be easily distinguished from other Turricaspia species based on its relatively broad shell, the low-convex whorls, and its small size (Neubauer et al. 2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
456BACB889218529ECCEAE6BBA1E9E37.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 m).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
74934ACC587DF78B2E2BB7795DC9C3AD.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
74934ACC587DF78B2E2BB7795DC9C3AD.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Endemic to the Caspian Sea, reported from the western part of the middle Caspian Sea (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
74934ACC587DF78B2E2BB7795DC9C3AD.taxon	discussion	Taxonomic notes. The very characteristic tripartite whorl profile allows an easy identification and discrimination from other Pontocaspian Pyrgulinae (Neubauer et al. 2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
74934ACC587DF78B2E2BB7795DC9C3AD.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 s).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4EF1DF9C58953C14264F9E307EF14DF9.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4EF1DF9C58953C14264F9E307EF14DF9.taxon	distribution	Type locality. Middle and southern Caspian Sea, 50 - 100 m. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4EF1DF9C58953C14264F9E307EF14DF9.taxon	discussion	Taxonomic notes. The status of this species is unclear. The drawing provided by Logvinenko and Starobogatov (1969) shows strong similarities to T. grimmi in terms of the nearly straight-sided whorls and the large aperture. Since the whereabouts of the type material is unknown, we refrain from a final conclusion on the potential synonymy.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
4EF1DF9C58953C14264F9E307EF14DF9.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 n).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B9528435D3E0020D75CA0904D91563EE.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B9528435D3E0020D75CA0904D91563EE.taxon	distribution	Type locality. Middle Caspian Sea. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B9528435D3E0020D75CA0904D91563EE.taxon	discussion	Taxonomic notes. The available drawing of this species suggests a very slender shell with highly convex whorls bearing a subsutural band. The type material has not been found, and the identity of this species remains unclear.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B9528435D3E0020D75CA0904D91563EE.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 t).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
523C0B676B12A5FB667BDE961904E50C.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
523C0B676B12A5FB667BDE961904E50C.taxon	distribution	Type locality. Eastern part of the middle Caspian Sea, 20 - 50 m. Distribution. Middle and southern Caspian Basin. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
523C0B676B12A5FB667BDE961904E50C.taxon	discussion	Taxonomic notes. Judging from the drawing in Logvinenko and Starobogatov (1969), presenting a small slender shell with ca. 5.5 highly convex whorls, the species might be based on a juvenile specimen. It might be a junior synonym of the similarly shaped T. meneghiniana (Issel, 1865). Without investigating the type material, which has not been found in the ZIN collection, the identity of this species remains unclear.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
523C0B676B12A5FB667BDE961904E50C.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42B109B01671A2A63C6F2281B8B4BD2E.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42B109B01671A2A63C6F2281B8B4BD2E.taxon	distribution	Type locality. Middle Caspian Sea, 40 - 120 m. Distribution. Middle and southern Caspian Sea. This species was mentioned from depths between 200 and 900 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42B109B01671A2A63C6F2281B8B4BD2E.taxon	discussion	Taxonomic notes. As for the previous species, it is highly uncertain whether this taxon is a distinct species. It might also be based on a juvenile and could be a synonym of an earlier described species, perhaps T. pulla or T. lyrata.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
42B109B01671A2A63C6F2281B8B4BD2E.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB0737FBE00320FF5ABE7DB729237D28.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB0737FBE00320FF5ABE7DB729237D28.taxon	distribution	Type locality. Western part of the middle Caspian Sea. Distribution. Middle and southern Caspian Sea. This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB0737FBE00320FF5ABE7DB729237D28.taxon	discussion	Taxonomic notes. The fast growing whorls terminating in a large body whorl with expanded aperture are characteristic for this species and facilitate discrimination from other Turricaspia species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CB0737FBE00320FF5ABE7DB729237D28.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 u).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B899F280ECA41F652440A081E09D7E89.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B899F280ECA41F652440A081E09D7E89.taxon	distribution	Type locality. Ostrov Chechen' (island in NW Caspian Sea), Dagestan, Russia. Distribution. Endemic to the Caspian Sea. Occurred also in the Aral Sea during the Holocene (Filippov and Riedel 2009) but now extinct there. It has been reported from the Holocene of Danube Delta (Anistratenko and Prisyazhniuk 1992) (see below).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B899F280ECA41F652440A081E09D7E89.taxon	discussion	Taxonomic notes. As the oldest described species presently attributed to Turricaspia, the validity of this species is without doubt. Its identity, however, is poorly known, given the limited information and poor drawing provided by Eichwald (1855), as well as the largely diverging concepts applied by later authors (see Neubauer et al. 2018 for a detailed discussion of the matter). We have a geographic record (Anistratenko and Prisyazhniuk 1992) that is outside the Caspian-Aral distribution range of this genus. Comparison of the Danube material with Caspian specimens suggests the identification might be correct, yet further detail study is required to assess whether the Danube record might actucally not be an unusual form of Laevicaspia lincta.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
B899F280ECA41F652440A081E09D7E89.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F97198954C6F7E0ECC5BA36BA9D6C1BF.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F97198954C6F7E0ECC5BA36BA9D6C1BF.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Middle and southern Caspian Sea. This species was mentioned from depths between 200 and 500 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F97198954C6F7E0ECC5BA36BA9D6C1BF.taxon	discussion	Taxonomic notes. The species is characterised by a slender conical shell with weakly convex whorls with weak subsutural swelling and a slightly inflated body whorl with large aperture.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F97198954C6F7E0ECC5BA36BA9D6C1BF.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5334BD39F5207B7BE0522BA2DEA4874B.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5334BD39F5207B7BE0522BA2DEA4874B.taxon	distribution	Type locality. Eastern part of the northern Caspian Sea. Distribution. Type locality only.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5334BD39F5207B7BE0522BA2DEA4874B.taxon	discussion	Taxonomic notes. Logvinenko and Starobogatov (1969) illustrated a comparably small shell with eight highly convex whorls, large body whorl, and large aperture. Reliable assessment of the species' status requires investigation of the type material, which has only been discovered in ZIN in June 2018 and awaits further study.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5334BD39F5207B7BE0522BA2DEA4874B.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DAE96B973B41D13E2DD35E940F525DDB.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DAE96B973B41D13E2DD35E940F525DDB.taxon	distribution	Type locality. Northern Caspian Sea. Distribution. Northern Caspian Sea and Volga Delta (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DAE96B973B41D13E2DD35E940F525DDB.taxon	discussion	Taxonomic notes. The species as illustrated by Logvinenko and Starobogatov (1969) is based on a slender shell with highly convex whorls. The same traits are also typical for Pyrgula astrachanica; in fact, the type of T. vinogradovi could be a juvenile of that species. Moreover, both of them might be synonyms of Turricaspia nossovi Kolesnikov, 1947. Since a part of the type material of the species involved is lacking and some of the taxa are based on incomplete or presumably juvenile specimens, the identities of Pyrgula astrachanica and Turricaspia vinogradovi remain unresolved.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
DAE96B973B41D13E2DD35E940F525DDB.taxon	conservation	Conservation status. Turricaspia vinogradovi has not been assessed by the IUCN, T. astrachanica is marked as " Data Deficient " (Vinarski 2011 q).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8065A8499677432E95D5ABAB7A82E858.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8065A8499677432E95D5ABAB7A82E858.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Middle and southern Caspian Sea (Logvinenko and Starobogatov 1969, Parr et al. 2007). Mirzoev and Alekperov (2017) mention Pseudamnicola brusinianus from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan but we are not entirely certain whether these records might include other Abeskunus species as well.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8065A8499677432E95D5ABAB7A82E858.taxon	discussion	Taxonomic notes. For a detailed description and discussion, see Neubauer et al. (2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
8065A8499677432E95D5ABAB7A82E858.taxon	conservation	Conservation status. Least Concern (Vinarski 2011 c).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CCE8A4A6A79F6B53B258DF7BFD93EA73.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CCE8A4A6A79F6B53B258DF7BFD93EA73.taxon	distribution	Type locality. Western part of the southern Caspian Sea, northward of Kuraginsky Kamen' [= Kuer Dasi] Island (approximately 39 ° 01 ' 05 " N, 49 ° 20 ' 02 " E), 81 m water depth. Distribution. In addition to the type locality, specimens have been found in Holocene material retrieved near the Kura Delta, a few kilometres north of the type locality.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CCE8A4A6A79F6B53B258DF7BFD93EA73.taxon	discussion	Taxonomic notes. Current investigations on recently collected Holocene material from the south-western Caspian Sea confirm that this species belongs to the genus Abeskunus. The finely ribbed, low trochiform shell facilitates distinction from its congeners. The species epithet is based on the Latin noun spira, spire, and is to be considered a noun in apposition (ICZN 1999, Art. 31.2.1.).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CCE8A4A6A79F6B53B258DF7BFD93EA73.taxon	conservation	Conservation status. Data Deficient (Vinarski 2011 d).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9ADCDF90FA3A508B90AC697410448B6F.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9ADCDF90FA3A508B90AC697410448B6F.taxon	distribution	Type locality. In fossil (likely Pleistocene) limestone of Dagestan, Russia. Distribution. Western Caspian Sea, known from northern and southern parts. Records from the eastern Caspian Sea by Logvinenko and Starobogatov (1969) could not be confirmed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9ADCDF90FA3A508B90AC697410448B6F.taxon	discussion	Taxonomic notes. An in-depth study of the literature suggests that the names Paludina exigua, Bithinia sphaerion syn. n., and Lithoglyphus caspius all refer to the same species. The name Lithoglyphus caspius was made available by Martens (1874) by referring to the description and illustration of Eichwald's species, rendering L. caspius a junior objective synonym of Abeskunus exiguus. All three taxa share the globular shape, short spire, and inflated last whorl. The subspecies Pseudamnicola brusiniana michelae syn. n. from Iranian coasts of the Caspian Sea closely resembles A. exiguus and is herein considered a synonym as well. Abeskunus exiguus differs from A. brusinianus in the highly globular shell with small spire. A revision of the species is currently being prepared.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
9ADCDF90FA3A508B90AC697410448B6F.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0378A1BB2F6B835D0180A6E54504FE4C.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0378A1BB2F6B835D0180A6E54504FE4C.taxon	distribution	Type locality. Eastern part of the South Caspian Sea (39 ° 05 ' N, 52 ° 35 ' E). Distribution. Middle and southern Caspian Sea (Starobogatov 2000).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0378A1BB2F6B835D0180A6E54504FE4C.taxon	discussion	Taxonomic notes. The species is very similar to the type species of Andrusovia, A. dybowskii, regarding the low spire. Investigation of the type material is required to clarify whether both taxa are distinct. Remarks. Only recently, paratypes of this species were detected at the Zoological Museum of Moscow University. A study of the taxonomy of Andrusovia is currently under way.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0378A1BB2F6B835D0180A6E54504FE4C.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5700F49732CF249F713830EFC5B7E492.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5700F49732CF249F713830EFC5B7E492.taxon	distribution	Type locality. Eastern part of the middle Caspian Sea (42 ° 42.5 ' N, 51 ° 32.5 ' E), at 80 m water depth. Distribution. Northern, middle, and southern Caspian Sea (Starobogatov 2000, Neubauer et al. 2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5700F49732CF249F713830EFC5B7E492.taxon	discussion	Taxonomic notes. The species was recently described in detail by Neubauer et al. (2018). The species was distinguished from A. dybowskii and A. andrusovi by the higher spire, but this is a variable character. Currently, the taxonomy of Andrusovia species is the subject of further study. Remarks. Starobogatov (2000) mentioned that the type material is housed in the ZIN collection, but we were unable to find the holotype and it is presumed lost. Only recently, paratypes of this species were detected at the Zoological Museum of Moscow University and are currently being studied.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
5700F49732CF249F713830EFC5B7E492.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1B64EC0B813E33B5B375F5EEEC94FB71.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1B64EC0B813E33B5B375F5EEEC94FB71.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Middle and southern Caspian Sea (Starobogatov 2000).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1B64EC0B813E33B5B375F5EEEC94FB71.taxon	discussion	Taxonomic notes. Apparently, Brusina considered both the more conical and flatter shells (" conoidea vel discoidea ") to belong to a single species. Starobogatov (2000) in turn referred only the flat type to as Andrusovia dybowskii and considered the conical ones to belong to separate species (A. brusinai and A. marina). The recently rediscovered type material represents the conico-globular type and is currently subject of study by V. Anistratenko and collaegues.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
1B64EC0B813E33B5B375F5EEEC94FB71.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E141926B6675FBF60A67457C32BFD9A1.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E141926B6675FBF60A67457C32BFD9A1.taxon	distribution	Type locality. Northern slope of the middle Caspian Sea Basin, 43 ° 32.5 ' N, 49 ° 17.5 ' E, 60 m water depth. Distribution. Middle and southern Caspian Sea (Starobogatov 2000). This species was mentioned from depths between 200 and 400 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Horatia marina).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E141926B6675FBF60A67457C32BFD9A1.taxon	discussion	Taxonomic notes. According to Neubauer et al. (2018), this species might be a senior synonym of A. brusinai Starobogatov, 2000. Inspection of recently discovered type material appears to support that view, but more in-depth studies are required to evaluate the status of this species. Remarks. The holotype is not traced and presumed lost. Only recently, paratypes of this species were detected at the Zoological Museum of Moscow University and are currently being studied.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
E141926B6675FBF60A67457C32BFD9A1.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2B0D838DAC25BC19FA31122E3BA16071.taxon	discussion	Status. Accepted native species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2B0D838DAC25BC19FA31122E3BA16071.taxon	distribution	Type locality. In the Danube at Vienna, Austria, and at Pesth (today part of Budapest), Hungary. Distribution. Originally only in rivers entering the Black Sea, in the Danube up to Regensburg (Germany). After 1800, also introduced to Elbe and Rhine regions by artificial canals; after 1900 in France (Welter-Schultes 2012). Very common in the Volga Delta (Vinarski et al. 2018).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
2B0D838DAC25BC19FA31122E3BA16071.taxon	conservation	Conservation status. Least Concern (Van Damme 2011 b).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CA5E507A10332D5CEF1BE95AA2C975A7.taxon	discussion	Status. Accepted species, invasive.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CA5E507A10332D5CEF1BE95AA2C975A7.taxon	distribution	Type locality. New Zealand (no details). Distribution. Originally from New Zealand, probably introduced in 1859 to England, in 1872 to Tasmania, in 1895 to mainland Australia, in ca. 1900 to European mainland (Ponder 1988), and in 1987 to North America (Zaranko et al. 1997).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CA5E507A10332D5CEF1BE95AA2C975A7.taxon	discussion	Taxonomic notes. The two Black Sea species P. polistchuki syn. n. and P. alexenkoae syn. n. are here considered as junior synonyms of P. antipodarum, differing only very weakly in outline. Vinarski and Kantor (2016) listed Pyrgula (Trachycaspia?) grossui syn. n. Golikov & Starobogatov in the synonymy of T. dimidiata (Eichwald, 1838). Golikov and Starobogatov (1966) introduced this species as new name for the supposedly misidentified Potamopyrgus jenkinsi sensu Grossu (1951) from Razim Lake in Romania. The shell they later illustrated (Golikov and Starobogatov 1972) indeed shows similarities with T. dimidiata. The shell illustrated in Grossu (1951), however, is completely different and shows a keeled form of P. antipodarum.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
CA5E507A10332D5CEF1BE95AA2C975A7.taxon	conservation	Conservation status. Least Concern (Van Damme 2013).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C84CA1E47D583C0913BFB4ED3B0BFE4.taxon	discussion	Status. Accepted Pontocaspian species.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C84CA1E47D583C0913BFB4ED3B0BFE4.taxon	distribution	Type locality. Caspian Sea (no details). Distribution. Middle and southern Caspian Sea (Logvinenko and Starobogatov 1969). This species was mentionedfrom depths between 200 and 900 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Anisus eichwaldi).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C84CA1E47D583C0913BFB4ED3B0BFE4.taxon	discussion	Taxonomic notes. The species is characterised by a relatively large, asymmetrical shell. Anisus eichwaldi infundibularis is probably a morphotype of G. eichwaldi. We are uncertain about the status of Anisus djalali Tadjalli-Pour, 1977 as the description is very brief and the photographs are not very clear. It may be within the range of the morphological variability of G. eichwaldi.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
0C84CA1E47D583C0913BFB4ED3B0BFE4.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F3719F20227A37D28210FA2AC78B6C23.taxon	discussion	Status. Pontocaspian species, identity uncertain.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F3719F20227A37D28210FA2AC78B6C23.taxon	distribution	Type locality. Caspian Sea, 40 ° 37 ' N, 50 ° 52 ' E, 115 m. Distribution. Middle and southern Caspian Sea (Logvinenko and Starobogatov 1969). This species was mentioned from depths between 200 and 300 m in the South Caspian Basin of Azerbaijan (Mirzoev and Alekperov 2017, who reported the species as Anisus colesnikovi [sic]).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F3719F20227A37D28210FA2AC78B6C23.taxon	discussion	Taxonomic notes. Logvinenko and Starobogatov (1966 b) considered this species and Andrusovia dybowskii Brusina in Westerlund, 1902 b to belong in the same genus, Anisus (Andrusovia), rendering P. dybowskii Kolesnikov, 1947 a junior homonym. Therefore, they introduced A. kolesnikovi as replacement name. Since both taxa do clearly not belong to the same genus or even the same family, the replacement name is to be discarded. The species resembles G. eichwaldi regarding the general habitus; it differs in the more pronounced angle at the transition between whorl flank and apical plane. A revision is required to investigate if the Caspian Gyraulus species are distinct species or morphotypes of G. eichwaldi. The generic placement follows Vinarski and Kantor (2016). Note that those authors listed the earlier described P. eichwaldi dybowskii Kolesnikov, 1947 as a synonym of G. kolesnikovi.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
F3719F20227A37D28210FA2AC78B6C23.taxon	conservation	Conservation status. Least Concern (for Anisus kolesnikovi; Vinarski 2011 a).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
95376548949023E7F7C4B94A77EA9C4B.taxon	discussion	Status. Pontocaspian species, identity uncertain, name invalid.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
95376548949023E7F7C4B94A77EA9C4B.taxon	distribution	Type locality. Caspian Sea, 42 ° 45 ' N, 48 ° 29 ' E, 79 m. Distribution. Middle Caspian Sea (Logvinenko and Starobogatov 1969).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
95376548949023E7F7C4B94A77EA9C4B.taxon	discussion	Taxonomic notes. The species in its present combination as Gyraulus sulcatus (following Vinarski and Kantor 2016) is invalid as it is a secondary homonym of the Miocene Gyraulus sulcatus (Hilgendorf, 1867). We refrain here from introducing a replacement name as the species' status is uncertain. It resembles G. eichwaldi and G. kolesnikovi in outline shape and differs only in the more pronounced angle between whorl flank and apical plane and the shallow furrow on the apical side. An in-depth revision is required to clarify if Gyraulus sulcatus is a distinct species or a mere morphotype of G. eichwaldi (Clessin & Dybowski in Dybowski, 1887).	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
95376548949023E7F7C4B94A77EA9C4B.taxon	conservation	Conservation status. Not assessed.	en	Wesselingh, Frank, Poorten, Jan Johan ter, Kijashko, Pavel, Albrecht, Christian, Anistratenko, Olga Yu, Frolov, Pavel, Gándara, Alberto Martinez, Gittenberger, Arjan, Gogaladze, Aleksandre, Mikhail Karpinsky, Popa, Luis, Sands, Arthur F, Vandendorpe, Justine, Wilke, Thomas (2019): Mollusc species from the Pontocaspian region - an expert opinion list. ZooKeys 827: 31-124, DOI: http://dx.doi.org/10.3897/zookeys.827.31365, URL: http://dx.doi.org/10.3897/zookeys.827.31365
