Anatoma schanderi, Hoisaeter & Geiger, 2011

Nekhaev, I. O. & Krol, E. N., 2020, A review of the genus Anatoma in the Eurasian Arctic seas (Gastropoda: Vetigastropoda: Anatomidae), Zoosystematica Rossica (China) 29 (1), pp. 128-137 : 136

Anatoma schanderi HØisaeter et Geiger, 2011

( Fig. 5A–C)

Scissurella crispata : Gorbunov, 1946: 45.

Anatoma crispata : Golikov et al., 2001: 104 (partim).

Anatoma schanderi HØisaeter et Geiger, 2011: 106–109,

figs 68–83; Geiger, 2012: 1081–1085, figs 881–885.

Material examined. Russia: East Siberian Sea , 57 m, 78°13′N, 142°13′E, 19 Dec. 1937, R / V Sadko , 1 shell ( ZIN 37032 ); Laptev Sea, 68 m, 76°48′N, 129°41′E, 8 Nov. 1937, R / V Sadko, 1 shell ( ZIN 37031 ) .

Redescription. Shell large, towering, fragile, slightly shiny, semitransparent. Spire high; whorls stepped; shell base convex. Protoconch of 0.75 whorls, with reticulate sculpture. Diameter of protoconch 190 µm, nucleus have 100 µm width. Teleoconch I of 1.0 whorl. Teleoconch II of 3.2 whorls. Upper parts of body whorls with 14 thin spirals riblets, shell base with 31 ones. Teleoconch I with 30 axial riblets; strong spiral cord present in position of selenizone. First whorl of teleoconch II with 41 axial riblets. Body whorl with 81 axials. Axials irregularly spaced. Spirals and axials of same size, forming reticulate sculpture. Aperture rounded. Umbilicus open, deep, with small funiculus. Space between selinizone and suture of subsequent whorl as wide as selenizone.

Measurements of largest specimen examined: NW 4.9, SH 4.20 mm, BWH 3.70 mm, AH 2.30 mm, SW 4.25 mm, AW 2.70 mm.

Remarks. The two empty shells collected from the waters around the New Siberian Islands (the Laptev Sea and the East Siberian Sea) clearly correspond to the description of A. schanderi , which was previously known only from the extreme North of the Atlantic: from Nova Scotia to the Norwegian Sea. The examined specimens are the only representatives of the genus known from the region, and apparently all the records of A. crispata from the Laptev Sea and the East Siberian Sea by the Russian authors (e.g. Gorbunov, 1946; Golikov, 1995; Golikov et al., 2001; Kantor & Sysoev, 2006) in fact refer to these specimens of A. schanderi .