Anatoma golikovi, Nekhaev & Krol, 2020

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 : 135-136

Anatoma golikovi sp. nov.

( Fig. 4A–B, D–F)

Holotype. Norway, Barents Sea, Svalbard, near Hopen I., 49 m, 76°11.04′N, 23°11.78′E, 21 Aug. 2008, R / V Dal’nie Zelentsy ( ZIN 62138 /1).

Diagnosis. Anatoma golikovi sp. nov. differs from all Arctic species of the genus in its planispiral shell with a depressed spire, the presence of distinct funiculus, and embryonic shell with sculpture of loose flocculae.

Description. Shell small, fragile, slightly shiny, cream, semitransparent. Spire flat; body whorl relatively large, lenticular; shell base convex. Protoconch of 0.8 whorls, with sculpture of loose flocculae, which tending to form irregular spiral riblets. Diameter of protoconch 240 µm, nucleus 70 µm wide. Teleoconch I of 0.7 whorls. Teleoconch II of 1.1 whorls. Six thin spirals riblets on upper parts of body whorls and 17 on shell base. Teleoconch I with 16 axial riblets. Teleoconch II with 51 strong axial ribs. Shell base with 60 axial riblets. Spirals and axials forming reticulate sculpture around umbilicus.

Aperture rounded; outer lip almost straight above selenizone and rounded under selenizone and columellar lip. Umbilicus open, deep, with distinct funiculus. Space between selinizone and suture of subsequent whorl almost equal to width of selenizone.

Measurements of holotype: NW 2.6, SH 0.93 mm, AH 0.86 mm, SW 1.50 mm, AW 0.79 mm.

Distribution. Known only from the type locality.

Habitat. The holotype was collected from the sea bottom with sand, shellrock and pebbles. The temperature at the collecting site was +2.17°C, salinity 33.84‰.

Remarks. Anatoma crispata differs from A. golikovi sp. nov. in having an elevated spire (see Fig. 4B–C for comparison) which is visible even in young specimens (with less than one whorl on teleoconch II). Anatoma schanderi can be distinguished from the new species by its larger size, elevated spire and reticulate pattern on the embryonic shell. Anatoma tenuisclupta (Seguenza, 1880) which is known from the Norwegian coast differs in the lacking funiculus and elevated spire.

Etymology. The species is named after Alexan- der Golikov, a prominent malacologist and benthic ecologist.