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The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean
No full textChaban, 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/zlab11
Figure 1 in The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean
No full textFigure 1. Map illustrating the collection sites of deepsea aglajids in the Sea of Okhotsk and Bussol Strait of the Kuril Islands.Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on page 199, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
Figure 2 in The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean
No full textFigure 2. Molecular phylogenetic hypotheses of the superfamily Phillinoidea showing relationships between Aglajidae genera, based on a concatenated dataset of four markers (COI, 16S, H3, 28S). Outgroup taxa are collapsed by their families, aglajid taxa except Aglaona gen. nov. by their genera. A, Bayesian inference, posterior probabilities higher than 0.9 are shown in the respective node. B, maximum likelihood; bootstrap values higher than 60% are shown in the respective nodes.Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on page 202, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
Figure 3 in The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean
No full textFigure 3. Molecular phylogenetic hypotheses of the family Aglajidae, concatenated dataset of four markers (COI, 16S, H3, 28S), Bayesian inference. Outgroup taxa are collapsed by their families, aglajid taxa except Aglaona gen. nov. by putative species-level clades. Posterior probabilities from Bayesian inference higher than 0.9 are shown above each branch, bootstrap values of maximum likelihood higher than 60% below each branch. Morphological characters states (A, shell; B, gizzard plates; C, radula) are shown in three bars on the right.Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on page 203, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
Figure 4 in The new genus Aglaona: the first abyssal aglajid (Heterobranchia: Cephalaspidea: Aglajidae) with a description of two new species from the north-western Pacific Ocean
No full textFigure 4. Aglaona rudmani gen. & sp. nov. dorsal view of the holotype (A); ventral view of a paratype (B); paratype shell, ventral view, SEM the 'wing-like' callus is marked with an arrow (C); shell apex, SEM (E); shell spiral sculpture, SEM (D); radula, SEM (F); lateral teeth (G); copulatory system (SEM) (H); sketch, dissected penial sheath (I); chitinous stylet of penis SEM (J). Abbreviations: ej, ejaculatory duct opening; f, foot; pr, penial prostate; sh, headshield; psh, penial sheath; st, penial stylet. Scale bars: 2 mm (C), 1 mm (A, B), 500 µm (H), 400 µm (E), 200 µm (D), 100 µm (F, J), 50 µm (G).Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on page 205, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
FIGURE 2 in Meloscaphander grandis (Heterobranchia: Cephalaspidea), a deep-water species from the North Pacific: Redescription and taxonomic remarks
No full textFIGURE 2. Bayesian phylogenetic tree of the family Scaphandridae based on the concatenated dataset. Species-level clades are collapsed to a single specimen per species. Numbers above branches indicate the posterior probabilities, bellow—bootstrap support values. Distribution patterns are highlighted in color: Atlantic (blue), North Pacific (green), Indo-West Pacific (red). Sagaminopteron psychedelicum is chosen as outgroup. Studied specimen of Meloscaphander grandis is highlighted in bold.Published as part of Chaban, Elena M., Ekimova, Irina A., Schepetov, Dimitry M. & Chernyshev, Alexei V., 2019, Meloscaphander grandis (Heterobranchia: Cephalaspidea), a deep-water species from the North Pacific: Redescription and taxonomic remarks, pp. 385-400 in Zootaxa 4646 (2) on page 390, DOI: 10.11646/zootaxa.4646.2.12, http://zenodo.org/record/334939
Aglajidae Pilsbry 1895
No full textFAMILY AGLAJIDAE PILSBRY, 1895 (1847) 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, 2021a) and another new genus, Aglaona, which is described below.Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on page 204, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
Aglaona Chaban & Ekimova & Schepetov & Chernyshev 2022, GEN. NOV.
No full textGENUS AGLAONA GEN. NOV. 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: 05553D3C-3DCF-4F61-B91B-952A8E62F268 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 4D, 9E). 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., 2019a). 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. 4C). We name this callus form as ‘wing-like’ and consider it an important character of the new genus.Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on page 204, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
Aglaona valdesi Chaban & Ekimova & Schepetov & Chernyshev 2022, SP. NOV.
No full textAGLAONA VALDESI SP. NOV. (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: 076EBBFA-C017-46B1-8C19-505F60E9CAE3 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.Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on pages 206-208, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
Aglaona rudmani Chaban & Ekimova & Schepetov & Chernyshev 2022, SP. NOV.
No full textAGLAONA RUDMANI SP. NOV. (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: B4F1A566-0EBE-4A3E-A1CA-E8C5B773316E 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.Published as part of 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, pp. 198-214 in Zoological Journal of the Linnean Society 196 on page 206, DOI: 10.1093/zoolinnean/zlab115, http://zenodo.org/record/703528
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