taxonID	type	description	language	source
03B3E73BFF8D4F38FF6EBAFC9D4FFE50.taxon	diagnosis	Diagnosis (modified from Zamora-Silva & Malaquias, 2018): Shell internal, typically reduced, but welldeveloped bulloid in some species. Mantle typically with caudal asymmetrical lobes. Gizzard plates absent. Radula typically absent; when present, radular formula 1: 0: 1 or 2: 1: 0: 1: 2; inner laterals bearing one or two large or many small denticles on inner border. Penial papilla with chitinous stylet or plate. Yellow gland present (in histologically studied specimens). Sensory mound on anterior part of head with numerous bristles over surface, or without bristles in some species. Fifteen genera have been included in the family (MolluscaBase eds, 2021 a) and another new genus, Aglaona, which is described below.	en	Chaban, Elena M., Ekimova, Irina A., Schepetov, Dimitry M., Chernyshev, Alexei V. (2022): The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean. Zoological Journal of the Linnean Society 196: 198-214, DOI: 10.1093/zoolinnean/zlab115, URL: https://doi.org/10.1093/zoolinnean/zlab115
03B3E73BFF8D4F36FC49BB6A9980FEF4.taxon	materials_examined	Type species: Aglaona rudmani sp. nov. Diagnosis: Headshield and posterior shield without posterior lobes. Parapodia small. Foot short, extending to half of shell length. Posterior end of posterior shield angulated or truncated. Shell internal, bulloid, oval, up to 4.0 mm in length, apex obtuse, spire partly visible; spiral sculpture with chains of narrow pits; parietal callus wing-like. Gizzard plates absent; radula 2: 1: 0: 1: 2; laterals bearing numerous small denticles on internal border. Copulatory system with short prostate; large, conical, penial papilla armed with a small, triangular chitinous plate or a large, chitinous multicusped stylet. Yellow gland and sensory bristles not detected. The new genus includes two new species: Aglaona rudmani sp. nov. and A. valdesi sp. nov .. Comparison: The new genus differs from all described genera of the family Aglajidae by the presence of an internal and well-developed bulloid shell. Etymology: The genus name is a contraction of the family name Aglajidae, in which it is placed, and the philinoid genus Laona A. Adams, 1865, to which it resembles in external and internal morphology. Remark: The callus of cephalaspidean shells is often thin and looks like a narrow band along the inner lip of the aperture tapering to its anterior part (see Philine guineensis Ev. Marcus & Er. Marcus, 1966 or Ph. schrammi Malaquias, Ohnheiser, Oskars & Willassen, 2016 in Malaquias et al., 2016: figs 4 D, 9 E). Sometimes in taxonomical descriptions the callus morphology is not mentioned at all or noted only as ‘ parietal callus present’. The simple narrow callus mentioned above was described as ‘ ribbon-like’ for the philinids Spiraphiline hadalis Chaban et al., 2019 and Spiraphiline kurilokamchatica Chaban et al., 2019 (Chaban et al., 2019 a). However, shells of Aglaona have a different morphology of the callus: it is narrow in the apical part of the shell, steadily widening to the middle of the body whorl, it then narrows rapidly to the columellar part of the aperture (Fig. 4 C). We name this callus form as ‘ wing-like’ and consider it an important character of the new genus.	en	Chaban, Elena M., Ekimova, Irina A., Schepetov, Dimitry M., Chernyshev, Alexei V. (2022): The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean. Zoological Journal of the Linnean Society 196: 198-214, DOI: 10.1093/zoolinnean/zlab115, URL: https://doi.org/10.1093/zoolinnean/zlab115
03B3E73BFF834F36FEACB8C49C18FE53.taxon	description	(FIGS 1, 4) Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org: act: B 4 F 1 A 566 - 0 EBE- 4 A 3 E-A 1 CA-E 8 C 5 B 773316 E Type specimens: Holotype, ZIN 62465, Sea of Okhotsk, Kuril Basin, SokhoBio expedition, R / V Akademik M. A. Lavrentyev, Cruise 71, station 11 – 6, 1 August 2015, 45 ˚ 35.3 ΄ N 146 ˚ 24.7 ΄ E, depth 3206 m (sequenced). Paratypes: The same station as the holotype; two dissected specimens, ZIN 62699 (sequenced) and ZIN 62700 (sequenced). Type locality: Sea of Okhotsk, Kuril Basin, 45 ˚ 35.3 ΄ N 146 ˚ 24.7 ΄ E, depth 3206 m. Diagnosis: Headshield with angulated posterior edge; apex with two whorls visible; spiral sculpture with chains of narrow, elongated pits of unequal height. Head copulatory system with penial papilla armed with a large, chitinous, denticulate stylet. Description: Preserved holotype up to 5.1 mm long, c. twice as long as wide. Body white, almost completely retracted into shell. Headshield short, rounded anteriorly and angulated posteriorly, c. one-fifth of body length. Parapodia small; foot short, extending to half of shell length. Parapodia and foot strongly contracted. Shell internal, white, semitransparent, occupying entire posterior shield, 4.8 mm in length and 3.3 mm in width. Shell oval, wider anteriorly; apex truncated, covered with callus; two whorls visible. Periphery of body whorl regularly oval. Aperture pear-shaped, upper margin slightly protruding beyond apex. Outer lip thin, fragile. Parietal wall convex, covered with a wide wing-shaped callus; columellar border of inner lip straight, covered with narrow callus. Growth lines weak, frequent; spiral sculpture consists of thin, frequent chains of shallow, narrow, elongated pits of unequal height connected with narrow grooves. Buccal bulb muscular, with chitin lining inside and developed radular sac posteriorly; salivary glands short. Radular formula 16 × 2: 1: 0: 1: 2. Laterals large, hook-shaped, bearing small denticles on internal border; marginal small, hook-shaped, without denticles. Cephalic penial complex with large, elongated, penial sheath and a short, thick, convoluted prostate; prostate longer than penis. Penis armed with large, slightly curved, chitinous stylet; its ventral end bears c. six small denticles. Distribution: Sea of Okhotsk, Kuril Basin, depth 3206 m. Etymology: This species is named for Dr William (Bill) B. Rudman for his contributions to the study of heterobranch molluscs.	en	Chaban, Elena M., Ekimova, Irina A., Schepetov, Dimitry M., Chernyshev, Alexei V. (2022): The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean. Zoological Journal of the Linnean Society 196: 198-214, DOI: 10.1093/zoolinnean/zlab115, URL: https://doi.org/10.1093/zoolinnean/zlab115
03B3E73BFF834F34FC4FBB459A04FAE2.taxon	description	(FIGS 1, 5) Z o o b a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org: act: 076 EBBFA-C 017 - 46 B 1 - 8 C 19 - 505 F 60 E 9 CAE 3 Type specimens: Holotype: ZIN 62696, Kuril Islands, Pacific slope of the Kuril Islands near the Bussol Strait, SokhoBio expedition, R / V Akademik M. A. Lavrentyev, Cruise 71, station 9 – 7, 26 July 2015, 46 ˚ 16.2 ΄ N 152 ˚ 03.1 ΄ E, depth 3374 m (sequenced). Paratypes: ZIN 62463, SokhoBio, station 9 – 7, one specimen (dissected, sequenced); ZIN 42464, SokhoBio, station 9 – 7, one specimen (sequenced); ZIN 62697, SokhoBio, station 9 – 7, two specimens; ZIN 62698, SokhoBio, station 9 – 9, 27 July 2015, 46 ˚ 15.7 ΄ N 152 ˚ 03.1 ΄ E, depth 3580 m, one specimen. Type locality: Kuril Islands, Pacific slope of the Kuril Islands near the Bussol Strait, 46 ˚ 16.2 ΄ N 152 ˚ 03.1 ΄ E, depth 3374 m. Diagnosis: Headshield truncated at its posterior end; apex with one whorl visible; spiral sculpture with chains of narrow elongated pits of equal height. Head copulatory system with large conical penial papilla armed with a small triangular chitinous plate. Description: Preserved specimens up to 5.3 mm long, c. twice as long as wide. Body white, almost completely retracted into shell. Headshield short, rectangular, rounded anteriorly and truncated posteriorly, c. onefifth of body length. Parapodia small; foot short, extending to half of shell length. Parapodia and foot strongly contracted. Shell internal, white, semitransparent, occupying entire posterior shield, 4 mm long and c. 3 mm wide in the largest paratype. Spire consisting of a body whorl, covered with callus. Shell oval, wider anteriorly, widest in the middle of body whorl, apex obtuse. Periphery of body whorl regularly oval. Aperture not protruding beyond apex. Outer lip thin, fragile. Parietal wall convex, covered with a wide, wing-shaped callus; columellar border of inner lip straight, covered with narrow callus. Growth lines weak, frequent; spiral sculpture consists of thin, frequent chains of shallow, narrow, elongated pits of equal height connected with narrow grooves. Buccal bulb muscular, with chitin lining inside and developed radular sac posteriorly; salivary glands short. Radular formula 13 × 2: 1: 0: 1: 2. Laterals large, hook-shaped, bearing small denticles on internal border; marginal small, hook-shaped, without denticles. Cephalic penial complex with large, elongated, penial sheath and a short, thick, convoluted prostate; prostate almost equal in length with penial sheath; penis consisting of large, conical papilla and small, triangular chitinous plate. Comparison: Aglaona valdesi differs from A. rudmani in the head shape (truncated at its posterior end in A. valdesi vs. triangular in A. rudmani) and penial armature (a microscopic triangular plate in A. valdesi vs. a large stylet with additional cusps in A. rudmani) (Table 4). Distribution: Kuril Islands, Pacific slope of the Kuril Islands near the Bussol Strait, at 3374 m depth. Etymology: This species is named for Dr Ángel Valdés for his contributions to malacology in general and to cephalaspidean research in particular.	en	Chaban, Elena M., Ekimova, Irina A., Schepetov, Dimitry M., Chernyshev, Alexei V. (2022): The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean. Zoological Journal of the Linnean Society 196: 198-214, DOI: 10.1093/zoolinnean/zlab115, URL: https://doi.org/10.1093/zoolinnean/zlab115
