identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
D9038022D93AFFE8FF5BFD71FACC699F.text	D9038022D93AFFE8FF5BFD71FACC699F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Petersenaspis apinyae Plathong & Plathong & Salazar-Vallejo 2021	<html xmlns:mods="http://www.loc.gov/mods/v3">
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            <p> Petersenaspis apinyae sp. nov.</p>
            <p>LSID urn:lsid:zoobank.org:act: 5083A547-AD34-4A1E-8328-1B49765744F8</p>
            <p>Figs 3–4</p>
            <p>
                 Material examined.   43 specimens, all collected from 50–80 m deep in the offshore  
                <a title="Search Plazi for locations around (long 101.77417/lat 8.621111)" href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=101.77417&amp;materialsCitation.latitude=8.621111">Petroleum Production Area</a>
                 , the Gulf of Thailand, Western Pacific; mud mixed with sand and shells; coll. Marine Ecosearch Management Company (MEM). Holotype: PSUZC-POL-0268 (1 spec.), GT-W (8°37’16”N, 101°46’27”E), 23 Mar 2010  , 72 m. Paratypes: PSUZC-POL-0269 (1 spec.), GT-SB (9°42’35”N, 101°19’09”E), 8 Mar 2009, 60 m; PSUZC-POL-0270 (1 spec.), GT-PL (9°40’43”N, 101°23’09”E), 11 Mar 2009, 60 m; PSUZC-POL-0271 (1 spec.), GT-H (9°38’23”N, 101°13’21”E), 14 Mar 2009, 60 m; PSUZC-POL-0272 (1 spec.), GT-MK (8°33’48”N, 101°47’22”E), 20 Mar 2009, 80 m; PSUZC-POL-0273 (1 spec. on SEM stub), GT-U (8°23’02”N, 101°43’39”E), 21 Mar 2009, 80 m; PSUZC- POL-0274 (1 spec.), GT-R (8°53’01”N, 101°31’56”E), 20 Mar 2010, 70 m; PSUZC-POL-0275 (1 spec.), GT-T2-2 (8°54’16”N, 101°28’52”E), 26 Apr 2011, 72 m; PSUZC-POL-0276 (1 spec.), GT-T2-1 (8°54’06”N, 101°29’01”E), 27 Apr 2011, 72 m; PSUZC-POL-0277 (1 spec.), GT-T3 (8°33’52”N, 101°37’02”E), 28 Apr 2011, 72 m; PSUZC- POL-0278 (2 specs., 1 juvenile), GT-UP (8°37’16”N, 101°46’27”E), 1 Apr 2012, 76 m; PSUZC-POL-0279 (1 spec.), GT-L (9°06’15”N, 101°14’05”E), 10 Jun 2015, 50 m; PSUZC-POL-0280 (1 spec.), GT-SG (9°23’13”N, 101°21’35”E), 12 Jun 2015, 50 m; PSUZC-POL-0281 (1 spec.), GT-SF (9°25’09”N, 101°19’18”E), 11 Jun 2015, 50 m; PSUZC-POL-0282 (1 spec.), GT-SA (9°17’37”N, 101°25’27”E), 12 Jun 2015, 50 m; PSUZC-POL-0283 (1 spec., on SEM stub), GT-L-7 (9°06’43”N, 101°07’40”E), 9 Sep 2015, 64 m; PSUZC-POL-0284 (1 spec.), GT-W2-19 (8°29’48”N, 101°42’46”E), 9 Sep 2015, 71 m; PSUZC-POL-0285 (1 spec.), GT-W2-3 (8°29’39”N, 101°42’55”E), 9 Sep 2015, 71 m; PSUZC-POL-0286 (1 spec.), GT-W2-11 (8°30’02”N, 101°42’32”E) 10 Sep 2015, 71 m; PSUZC- POL-0287 (1 spec.), GT-R (8°53’04”N, 101°31’59”E), 25 Jun 2016, 69 m; PSUZC-POL-0288 (1 spec., on SEM stub), GT-SF (9°25’18”N, 101°19’09”E), 22 Jun 2018, 69 m; PSUZC-POL-0289 (1 spec., juvenile), GT-PG-23 (9°43’17”N, 101°22’26”E), 3 Jul 2018, 60 m; PSUZC-POL-0290 (1 spec.), GT-PG-44 (9°42’48”N, 101°22’43”E),  5 Jul 2018, 60 m; AM W.52923 (1 spec.), G4/43 REF (10°33’26”N, 100°48’03”E) , 15 Apr 2011, 60 m. 
            </p>
            <p>Additional material: The offshore Petroleum Production Area, the Gulf of Thailand: 2 specs., GT-T2-3 (8°54’06”N, 101°29’01”E), 23 Apr 2011, 60 m; 1 spec., GT-UB (8°28’24”N, 101°52’42”E), 30 Mar 2012, 76 m; 2 specs., GT-W (8°29’50”N, 101°42’43”E), 30 Mar 2014, 71.0 m; 2 specs., GT-UB (8°28’24”N, 101°52’42”E), 9 Sep 2015, 70 m; 1 spec., GT-I (9°38’54”N, 101°12’55”E), 11 Sep 2015, 68 m; 1 spec., GT-PM-23 (9°45’28”N, 101°17’59”E), 3 Jul 2018, 73 m; 1 spec., GT-R (8°53’02”N, 101°31’56”E), 28 Mar 2019, 70 m; 4 specs., GT-Q, 30 Mar 2019,70 m; 1 spec., GT-Q-38 (8°55’59”N, 101°35’26”E); 1 spec., GT-Q-50 (8°56’00”N, 101°35’17”E); 1 spec., GT-Q-6 (8°56’09”N, 101°35’19”E); 1 spec., GT-Q-8 (8°56’10”N, 101°35’13”E).</p>
            <p>  Type locality.  Gulf of Thailand, offshore petroleum concession area (Fig. 2)  . </p>
            <p>Description. Holotype complete without sediment particles; body 9.2 mm long, 3.7 mm wide, abdomen 7.0 mm long, about 20 segments, whitish in alcohol (Fig. 3A–B). Abdominal papillae thin, long. Paratypes, 13 specimens complete with exposed anterior region: 11 specimens mature, body 4.0– 12.6 mm long, 1.8–3.5 mm wide, abdomen 2.7–4.2 mm long, about 20 segments: 2 specimens juvenile, body 2.0– 2.3 mm long, 0.8 mm wide, abdomen 1.5–1.6 mm long. Eight specimens with introvert invaginated; body 5.4–8.3 mm long, 2.7–4.2 mm wide, and abdomen 5.2–6.7 mm long.</p>
            <p>Prostomium rounded (not completely exposed in holotype but fully exposed in some paratypes); peristomium rounded, with short papillae extended behind prostomium. Mouth circular with papillae extending from base of prostomium to anterior edge of first chaetiger (Figs 3C, 4A–B).</p>
            <p>First three chaetigers with 11–16 large golden spatulate hooks and small golden spatulate hooks with up to 11 hooks, without subdistal dark areas (Figs 3A–C, 4A–D). Genital papillae short, conical, protrude ventrally from body wall between segments 7 and 8 (Figs 3A–B, 4A–D).</p>
            <p>Pre-shield region of eight segments (Fig. 3A–B), with single lateral bundles of 2–4 (mostly 3) short thin capillary chaetae (Fig. 4E) protruding from body wall along segments 8–14. Paratype with capillaries along chaetigers 8–15. Body papillae along dorsal and ventral surfaces small, minute; lateral papillae long, thin (Fig. 4F–G).</p>
            <p>Ventro-caudal shield with sediment particles and abundant, fine, long papillae; shield wider than long, butterfly wing-shaped, orange to reddish, integument without ciliary clumps; suture extended throughout shield. Shield without well-developed ribs and concentric lines. Anterior margins angular, anterior depression shallow. Anterior keels exposed. Lateral margins strongly curved, expanded anteriorly, reduced medially to posterior. Posterior shield wide and slightly curved. Fan with a median notch and two lateral notches. Median notch shallow (Figs 3A, E–J, 4D, G–H). Juvenile ventro-caudal shield yellowish with anterior and lateral margins rounded, fan with a median notch and smooth margin. Peg chaetae absent.</p>
            <p>Chaetal fascicles on marginal shield include 10 lateral fascicles, chaetae of each fascicle in offset and parallel arrangement, no concentric lines, and 12 posterior fascicles, 7 with 3–4 chaetae each (1–2 fine capillary chaetae) and 5 in lateral notch with about 3 delicate and very long capillary chaetae. The long fine chaetae are located at both sides of the lateral notch, near lateral chaetae, longer than abdomen region, or about 3 times as long as posterior chaetae. These chaetae are fragile, some broken in every specimen, about 3–5 intact chaetae instead of 15.</p>
            <p>Branchial filaments abundant (Figs 3A–B, E, 4F, H), consisting of two parts; the first part is the branchial body, coiled, the second a long filament with bloated posterior (Figs 3A–B, 4H, F, I), the base of branchial body connected to branchial plate. Branchial plates with long papillae and sediment particles (Fig. 3D). The anterior branchial body can retract leaving the long filament exposed. The branchia and filament are connected by a small ring (Fig. 4K). Branchiae are whitish, neither smooth nor covered with cilia (Fig. 4L), and the filament holder is golden or brownish, smoother than the branchia and composed of small rings (Fig. 4M), the posterior end is bloated with larger rings. The outer surface of each posterior ring is embossed with a row of ovoid shapes and tips roughly resembling the pads of a gecko’s feet. Their tips are often swollen and have a tapered end (Fig. 4J). They might possibly help by sucking or sticking to adjacent sediment particles to support the body.</p>
            <p>Variation. Juveniles with body wall and ventro-caudal shield very thin, transparent; shield light yellow to light brown. Adults with thicker body wall and harder shields.</p>
            <p>Etymology. The species name is in recognition of Mrs. Apinya Sukolra of the SEM section, Office of Scientific Instrument and Testing (OSIT), Prince of Songkla University, for her assistance with SEM photographs of polychaetes during the last 4 years.</p>
            <p>Habitat. Found at 50–80 m depth, in muddy sediments mixed with sand and shells, offshore Gulf of Thailand.</p>
            <p>Distribution. Only known in the offshore Petroleum Production Area, Gulf of Thailand (Figs 1, 2).</p>
            <p> Remarks.  Petersenaspis apinyae sp. nov. resembles  P. palpallatoci Sendall &amp; Salazar-Vallejo, 2013 ,  P. narisarae sp. nov. , and  P. pakbaraensis sp. nov. in having homogenously pigmented shields and both a median notch and two lateral notches. However,  P. apinyae sp. nov. has more introvert hooks and posterior chaetae than  P. palpallatoci with 20–22 introvert hooks per fascicle and 12 fascicles of posterior shield chaetae.  P. palpallatoci has about 12–14 introvert hooks and 10 fascicles of posterior shield chaetae (Sendall &amp; Salazar-Vallejo 2013). Moreover,  P. apinyae sp. nov. has a butterfly wing-shaped shield with lateral margins strongly curved and expanding anteriorly; and more lateral abdomen chaetae than  P. palpallatoci , with up to 3 simple chaetae per bundle from segment 8–15. In  P. palpallatoci , lateral shield margins are rounded, and there are only 2 simple lateral abdominal chaetae per bundle from segment 9–10 (Sendall &amp; Salazar-Vallejo 2013). </p>
            <p> Petersenaspis apinyae sp. nov. differs from  P. pakbaraensis sp. nov. by having 20–22 spatulate hooks per fascicle whereas  P. pakbaraensis sp. nov. has 13–19.  P. apinyae sp. nov. , unlike  P. pakbaraensis sp. nov. , does not have ciliary clumps, and the median notch is narrower and shallower than in  P. pakbaraensis . The posterior shield is wide and slightly curved, whereas the posterior shield of  P. pakbaraensis sp. nov. is narrow, protruding and strongly curved. </p>
            <p> Petersenaspis apinyae sp. nov. differs from  P. narisarae sp. nov. by having a homogenously pigmented shield whereas  P. narisarae has colored bands on its shield. Also, the abdomen of  P. apinyae sp. nov. is not expanded. </p>
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	https://treatment.plazi.org/id/D9038022D93AFFE8FF5BFD71FACC699F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Plathong, Jintana;Plathong, Sakanan;Salazar-Vallejo, Sergio I.	Plathong, Jintana, Plathong, Sakanan, Salazar-Vallejo, Sergio I. (2021): Three new species of Sternaspidae (Annelida: Sedentaria) from Thailand. Zootaxa 5081 (3): 373-388, DOI: 10.11646/zootaxa.5081.3.4
D9038022D93AFFECFF5BFC28FBD86EF6.text	D9038022D93AFFECFF5BFC28FBD86EF6.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Petersenaspis Sendall & Salazar-Vallejo 2013	<html xmlns:mods="http://www.loc.gov/mods/v3">
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            <p> Genus  Petersenaspis Sendall &amp; Salazar-Vallejo, 2013</p>
            <p>Diagnosis (after Fiege 2019). Sternaspids with introvert hooks subdistally expanded. Preshield region with eight segments. Ventrocaudal shield stiff with poorly developed ribs and no concentric lines.</p>
            <p> Key to species of  Petersenaspis Sendall &amp; Salazar-Vallejo, 2013</p>
            <p>(Modified after Salazar-Vallejo 2017)</p>
            <p>1A. Shield orange or reddish, rarely purple.................................................................... 2</p>
            <p> 1B. Shield bluish, anterior margin projected forward; anterior segments with four bands of dark brown papillae.............................................................................................  P. salazari Wu &amp; Xu, 2017 ; South China Sea </p>
            <p>2A. Shield with anterior margin truncate; fan with median notch only............................................... 3</p>
            <p>2B. Shield with anterior margin projected forward............................................................... 4</p>
            <p> 3A. First-three chaetigers with about 10 introvert hooks per side...............................  P. capillata Nonato, 1966 ; Central and Southern Brazil </p>
            <p> 3B. First three chaetigers with about 14–16 introvert hooks per side........................  P. deani Salazar-Vallejo, 2017 ; Costa Rica </p>
            <p>4A. Radial ribs well defined; fan with a median and two lateral notches.............................................. 5</p>
            <p> 4B. Radial ribs barely defined; fan with median notch, no lateral notches.................  P. harrisae Salazar–Vallejo, 2017 ; South Africa </p>
            <p>5A. Anterior shield expanded and lateral shield strong curved..................................................... 6</p>
            <p> 5B. Anterior shield rounded, not expanded and lateral shield rounded.........  P. palpallatoci Sendall &amp; Salazar-Vallejo, 2013 ; off Kalibo, Philippines </p>
            <p>6A. Shield with solid pigmentation, never banded............................................................... 7</p>
            <p> 6B. Shield with 2–3 concentric color bands, without ciliary clumps.................................  P. narisarae sp. nov. ; Gulf of Thailand, Western Pacific </p>
            <p> 7A. Shield butterfly wing-shaped, dark reddish without ciliary clumps................................  P. apinyae sp. nov. ; Gulf of Thailand, Western Pacific </p>
            <p> 7B. Shield heart- or kidney-shaped, dark purple with ciliary clumps; posterior margin of fan strongly projected, and laterally expanded...........................................................................  P. pakbaraensis sp. nov. ; Andaman Coast, Southern Thailand </p>
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	https://treatment.plazi.org/id/D9038022D93AFFECFF5BFC28FBD86EF6	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Plathong, Jintana;Plathong, Sakanan;Salazar-Vallejo, Sergio I.	Plathong, Jintana, Plathong, Sakanan, Salazar-Vallejo, Sergio I. (2021): Three new species of Sternaspidae (Annelida: Sedentaria) from Thailand. Zootaxa 5081 (3): 373-388, DOI: 10.11646/zootaxa.5081.3.4
D9038022D93EFFE6FF5BFB98FE1469BA.text	D9038022D93EFFE6FF5BFB98FE1469BA.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Petersenaspis narisarae Plathong & Plathong & Salazar-Vallejo 2021	<html xmlns:mods="http://www.loc.gov/mods/v3">
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            <p> Petersenaspis narisarae sp. nov.</p>
            <p>LSID urn:lsid:zoobank.org:act: 9862A44C-9251-43C9-A85C-9827D8E081C0</p>
            <p>Fig. 5</p>
            <p> Material examined. Seven specimens from the Songkhla Sea, Gulf of Thailand, Western Pacific, from muddy sediments mixed with sand and shells;  coll. Marine Ecosearch Management Company (MEM). All specimens were collected from sampling site S03 (7°21’02 ” N, 100°31’45 ” E), at 9 m. Holotype :  PSUZC - POL - 0291 (1 spec.), 21 May 2015 .  Paratypes: S03, PSUZC - POL - 0292 (2 specs., 1 juvenile), 30 Jan 2012 ;  PSUZC - POL - 0293 (1 spec., juvenile), 24 May 2012 ;  PSUZC - POL - 0294 (1 spec., juvenile), 11 Oct 2012 ;  PSUZC - POL - 0295 (1 spec., juvenile), 17 May 2016 ;  AM W.52925 (1 spec.), 1 Oct 2012 . </p>
            <p>Description. A small species, holotype complete, body whitish without sediment particles; anterior part not exposed, branchiae whitish, coiled, long straight filaments orange brown. Body 5.3 mm long, 3.5 mm wide, and abdomen 4.3 mm long (Fig. 5A – B). Paratypes, two large specimens, introvert invaginated; body 5.2 – 6.2 mm long, 3.6 – 4.3 mm wide. Others juvenile, two specimens with anterior region not exposed but with golden chaetae visible through body wall (Fig. 5D), 2.3–2.9 mm long, 1.2–1.7 mm wide, and abdomen 1.8–1.9 mm long; two specimens introvert exposed 1.3–4.3 mm long, 1.2–1.3 mm wide, and abdomen 0.7–2.7 mm long.</p>
            <p>Prostomium, peristomium and mouth not exposed, prostomium and middle of body fragile.</p>
            <p>First three chaetigers not visible in holotype or paratypes. In small paratypes, golden spatulate hooks visible through body wall (Fig. 5D); one juvenile had introvert exposed showing golden spatulate hooks.</p>
            <p>Pre - shield region with eight segments, oval shape (Fig. 5A, C) with single lateral bundles of 2 – 3 short, thin capillary chaetae, protruding from body wall along segments 9 – 13 in both holotype and paratypes. Body papillae at the dorsal and ventral surfaces small, minute; lateral body papillae long, thin.</p>
            <p>Ventro - caudal shield yellow - orange - reddish, butterfly wing - shaped with three colored bands; outer band yellow - orange, middle band reddish and widest, inner band darker and narrowest. Ventro - caudal shield plate with anterior, lateral and posterior margins rounded, fan with a deep median notch, margins smooth. Few papillae on shield surface and integument, without ciliary clumps. Radial ribs distinct, no concentric lines; posterior shield margin round (Fig. 5A, C, E, F).</p>
            <p>Marginal shield chaetae fascicles include 9 – 10 lateral fascicles in oval arrangement with offset and parallel fascicles, and 12 posterior fascicles, each with 2 – 3 chaetae: 1 long and strong; and 1 to 2 short and thin.</p>
            <p>Branchial filaments abundant, comprising two types: coiled, whitish; and straight, brown to golden. Each branchia starts from the branchial plate, the anterior part of the branchia is the base to which the branchia curls back leaving the long filament exposed. Branchiae in paratypes easily detached from branchial plates. Branchial plates wide, parallel distally, divergent basally; interbranchial papillae long, abundant (Fig. 5A, B, E, H).</p>
            <p>Variation. Juveniles have shields with barely defined colored bands (Fig. 5D).</p>
            <p>Etymology. The species name honors Ms. Narisara Kongcharoenkit, Mr. Sakanan Plathong’s secretary, who has helped with coastal and marine resources management for many years.</p>
            <p>Habitat. Found at 9 m depth, in muddy sediments mixed with sand and shells, Gulf of Thailand.</p>
            <p>Distribution. Only known from the Songkhla Sea, Gulf of Thailand (Figs 1, 2).</p>
            <p> Remarks.  Petersenaspis narisarae sp. nov. belongs to the group of  Petersenaspis species that present both a median notch and two lateral notches. It closely resembles  P. palpallatoci Sendall &amp; Salazar-Vallejo, 2013 ,  P. apinyae sp. nov. , and  P. pakbaraensis sp. nov. However,  P. narisarae sp. nov. differs from all these species in having 2–3 colored bands and an oval abdominal region that is also wider than the abdominal region of other species. These features are unique among all currently described  Petersenaspis species. P. narisarae sp. nov. , also has a shield that is anteriorly wider than that of  P. palpallatoci and a lateral shield and genital papillae that are smaller than those of  P. palpallatoci . </p>
            <p> Furthermore,  P. narisarae sp. nov. differs from  P. palpallatoci by the color of the introvert hooks, which are golden rather than bright bronze.  P. narisarae sp. nov. also has a shield which is anteriorly wider, and a lateral shield that is more strongly curved than  P. palpallatoci and exhibits yellow - orange - red bands. In  P. palpallatoci , the shield is not anteriorly wider, and the lateral shield is rounded and lacking colored bands. Moreover,  P. narisarae sp. nov. has 12 fascicles of posterior shield chaetae and 3 capillary chaetae per bundle at the lateral pre - shield rather than 10 fascicles and 2 capillary chaetae per bundle as occurs in  P. palpallatoci (Sendall &amp; Salazar-Vallejo 2013) . </p>
            <p> Petersenaspis narisarae sp. nov. differs from  P. apinyae sp. nov. and  P. pakbaraensis sp. nov. in the morphology of the lateral and posterior shields and their margins. In  P. narisarae sp. nov. these characters are more rounded, whereas the lateral shield in  P. apinyae sp. nov. is strongly curved with a very expanded anterior region and the posterior shield is straighter. In  P. pakbaraensis sp. nov. the lateral shield is expanded anteriorly, and the posterior shield is expanded laterally. Moreover,  P. narisarae sp. nov. presents 2 posterior shield chaetae per fascicle, while  P. apinyae and  P. pakbaraensis both present 3–4 chaetae per fascicle. The abdominal region in  P. narisarae sp. nov. is more expanded into an oval shape than in  P. apinyae sp. nov. and  P. pakbaraensis sp. nov. , which both have a narrower abdomen. The genital papillae in  P. narisarae sp. nov. are smaller than they are in  P. apinyae sp. nov. and  P. pakbaraensis sp. nov. . </p>
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	https://treatment.plazi.org/id/D9038022D93EFFE6FF5BFB98FE1469BA	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Plathong, Jintana;Plathong, Sakanan;Salazar-Vallejo, Sergio I.	Plathong, Jintana, Plathong, Sakanan, Salazar-Vallejo, Sergio I. (2021): Three new species of Sternaspidae (Annelida: Sedentaria) from Thailand. Zootaxa 5081 (3): 373-388, DOI: 10.11646/zootaxa.5081.3.4
D9038022D930FFE3FF5BFBBCFCFA6E0F.text	D9038022D930FFE3FF5BFBBCFCFA6E0F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Petersenaspis pakbaraensis Plathong & Plathong & Salazar-Vallejo 2021	<html xmlns:mods="http://www.loc.gov/mods/v3">
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            <p> Petersenaspis pakbaraensis sp. nov.</p>
            <p>LSID urn:lsid:zoobank.org:act: 3930540A-9BFA-483F-A008-54BB11DDDDFE</p>
            <p>Figs 6 – 7</p>
            <p>
                 Material examined.   28 specimens, all collected from  
                <a title="Search Plazi for locations around (long 99.72689/lat 6.8518333)" href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=99.72689&amp;materialsCitation.latitude=6.8518333">Pak Bara</a>
                 , Mu Ko Phetra National Park, in the Andaman Sea, Satun Province, Thailand; muddy sediments mixed with sand; coll. Marine Ecosearch Management Company (MEM) Holotype: PSUZC-POL-0296 (1 spec.), PAK-C3-B1 (6°51’6.6”N, 99°43’36.8”E), 16 Nov 2019, 1.5 m  . Paratypes: PAK-S2 (6°51’9.3”N, 99°43’33.7”E), 4 Jul 2019; PSUZC-POL-0297 (3 specs., 1 spec. on SEM stub), PAK-S2-B1; PSUZC-POL-0298 (2 specs.); PAK-S3 (6°51’7.5”N, 99°43’33.2”E), 4 Jul 2019; PSUZC-POL-0299 (3 specs.), PAK-S3-B1; PSUZC-POL-0300 (3 specs., 1 spec. on SEM stub), PAK-S3-B3; PSUZC-POL-0301 (1 spec.), PAK-S1-B1 (6°51’10.8”N, 99°43’34”E), 16 Nov 2019; PAK-C1 (6°51’9.3”N, 99°43’38.3”E), 16 Nov 2019; PSUZC-POL-0302 (4 specs., 2 specs. on SEM stubs), PAK-C1-B1; PSUZC-POL-0303 (2 specs.), PAK-C1-B2; PSUZC-POL-0304 (2 specs.), PAK-C2-B1 (6°51’7.9”N, 99°43’37.9”E), 16 Nov 2019; PSUZC-POL-0305 (2 spec., 1 spec. on SEM stub), PAK-C3-B2 (6°51’6.6”N, 99°43’36.8”E), 16 Nov 2019; PSUZC-POL-0306 (2 specs.), PAK- S6 (6°51’8”N, 99°43’3”E), 16 Feb 2018; PSUZC-POL-0307 (1 spec.), PAK-S7-B1 (6°51’14”N, 99°43’25”E), 17 Feb 2018; PSUZC-POL-0308 (1 spec.), PAK-S7-B2 (6°51’14”N, 99°43’25”E), 17 Feb 2018;  AM W.52924 (1 spec.), PAK-S2 (6°51’9.1”N, 99°43’36.7”E), 4 Jul 2019 . 
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            <p>Description. Holotype complete with sediment particles; body papillose, 7.0 mm long, 2.9 mm wide, abdomen 4.6 mm long (Fig. 6A), grayish to whitish in alcohol; body wall thin, transparent (Fig. 6A, B). Paratypes: eight specimens complete with exposed anterior region, 3.7–8.0 mm long, 2.2–2.6 mm wide, and abdomen 4.3–5.2 mm long; 13 specimens with introvert invaginated; body 3.3–6.2 mm long, 1.9–4.4 mm wide. Live specimens showed movement by extending and retracing the anterior part of the body (the prostomium and chaetiger 1–7) to the posterior part or abdomen. When retracted, the prostomium and first three chaetigers were not exposed.</p>
            <p>Prostomium rounded, rugose; peristomium surrounds prostomium, including mouth. Mouth circular with small papillae, extending from base of prostomium to anterior edge of first chaetiger (Fig. 7A, D).</p>
            <p>First three chaetigers with 8–13 large golden spatulate hooks, and 5–6 smaller thin golden spatulate hooks, without subdistal dark areas; hook numbers similar along chaetigers 1–3. Genital papillae, small, short, thin digitiform, protrude ventrally from body wall between segments 7 and 8.</p>
            <p>Pre-shield region with 8 segments, single lateral bundles of 2–3 capillary chaetae protruding from body wall along segments 8–15 (Figs 6A–C, 7A–C, F). Paratypes with capillaries along chaetigers 8 – 13. Dorsal and ventral body papillae are small, minute, lateral body papillae long and thin.</p>
            <p>Ventro-caudal shield heart- or kidney-shaped, dark red to dark purplish, almost black. Surface with abundant long papillae, integument with ciliary clumps and suture extended throughout shield (Figs 6A, B, F–I, 7A). Ribs distinct, concentric lines indistinct. Anterior margins angular, anterior depression shallow. Anterior keels not exposed. Lateral margins strongly curved, lobate, expanded anteriorly, reduced posteriorly. Fan with median notch and two lateral notches, posterior notch longer, median notch deep (Fig. 5F, H, I).</p>
            <p>Marginal shield chaetal fascicles include 9 lateral fascicles with chaetae, fascicles in oval arrangement, and 12 posterior fascicles, 7 at the posterior and 5 laterals (posterior chaetae mostly in bundles of three).</p>
            <p>Branchiae abundant, emerging from a pair of branchial plates, with abundant sediment particles (Figs 6B, D–F, 7B, C, H). Branchial filaments include two types: coiled, whitish filaments and long straight, golden or brownish filaments, filament tips stout and smooth (Figs 6A, B, E, F, 7B, C, H). These two parts are connected by a small ring at the end of the branchial body (whitish) and the base of the filament (brownish); the ring can only be observed by SEM.</p>
            <p>Variation. The ventro-caudal shield varies in large and small specimens. In larger specimens, shields are darker purple and the lateral margin of the posterior shield is expanded. In smaller specimens, shields are dark red and the lateral margin of the posterior shield is either not expanded or only slightly expanded. Ciliary clumps and papillae on the shield surface are long and more abundant in larger specimens. Genital papillae are short in paratypes and additional specimens; they are long only in the holotype, which suggests that they are retractable.</p>
            <p>Etymology. This species named is after Pak Bara, the locality where the specimens were collected.</p>
            <p>Habitat. The intertidal zone at Pak Bara, Mu Ko Phetra National Park, Southern of Thailand.</p>
            <p>Distribution. Only known from the type locality, Pak Bara, Andaman Coast, Southern Thailand (Figs 1, 2).</p>
            <p> Remarks.  Petersenaspis pakbaraensis sp. nov. Resembles  P. palpallatoci Sendall &amp; Salazar-Vallejo, 2013 and  P. apinyae sp. nov. , in having homogenously pigmented shields, and the presence of both a median notch and two lateral notches. However,  P. pakbaraensis sp. nov. differs from  P. palpallatoci in having a dark purple, almost black, shield with a fan about half as wide as the anterior shield margins whereas  P. palpallatoci has a reddish shield with a fan about as wide as the anterior margins (Sendall &amp; Salazar-Vallejo 2013). </p>
            <p> Petersenaspis pakbaraensis sp. nov. differs from  P. apinyae sp. nov. in having sediment particles on the body surface and branchial plates. Also, the papillae on the shield surface are longer and more abundant, and the integument has ciliary clumps. In  P. apinyae sp. nov. , the body surface and branchial plates are without sediment particles, the papillae on the shield surface are short and the integument is without ciliary clumps. Moreover, the shield of  P. pakbaraensis sp. nov. is dark red to purple, the posterior shield longer and the lateral posterior shield more expanded than in  P. apinyae sp. nov. , which has a deeper reddish shield, the posterior shield margins are wider than they are long and the lateral posterior shield is not expanded. </p>
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	https://treatment.plazi.org/id/D9038022D930FFE3FF5BFBBCFCFA6E0F	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		MagnoliaPress via Plazi	Plathong, Jintana;Plathong, Sakanan;Salazar-Vallejo, Sergio I.	Plathong, Jintana, Plathong, Sakanan, Salazar-Vallejo, Sergio I. (2021): Three new species of Sternaspidae (Annelida: Sedentaria) from Thailand. Zootaxa 5081 (3): 373-388, DOI: 10.11646/zootaxa.5081.3.4
