Aglaona rudmani Chaban & Ekimova & Schepetov & Chernyshev 2022, SP. NOV.
Creators: name: Chaban, Elena M.
name: Ekimova, Irina A.
name: Schepetov, Dimitry M.
name: Chernyshev, Alexei V.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Cephalaspidea
Aglajidae
Aglaona
Aglaona rudmani

description: AGLAONA 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.
description: 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/7035284