Dermatomya tenuiconcha ( Dall, 1913 )

Lisitsyna, Kseniya N. & Kamenev, Gennady M., 2024, New and rare bivalve species for the fauna of the Kuril Islands (northwestern Pacific Ocean): A study of materials collected over 70 years of expeditions (from 1949 to 2019), Zootaxa 5523 (2), pp. 231-253 : 243

Dermatomya tenuiconcha ( Dall, 1913)

( Fig. 3 M, N )

Poromya tenuiconcha Dall, 1913: 596 .

Dermatomya kurilensis Scarlato, 1981: 427 , 428; photos 461, 462.

Dermatomya tenuiconcha ( Dall, 1913) — Coan, Valentich-Scott & Bernard 2000: 572–573, pl. 124.

Material examined: 24 specimens from the ocean and sea slopes of Shikotan , Iturup , Urup , Broutona , Simushir , Ekarma , Onekotan , and Paramushir Islands and from the Fourth Kuril Strait (100–490 m) .

Distribution: Sea of Japan; Kuril Islands, Fourth Kuril Strait; Bowers Bank, Aleutian Islands, Alaska, to off La Jolla, California (100– 2,200 m) ( Scarlato 1981; Coan, Valentich-Scott & Bernard 2000; Okutani 2000; Kantor & Sysoev 2005; Lutaenko & Noseworthy 2012).

Remarks: Having examined nine specimens from one sample collected from off Iturup Island at a depth of 414 m, Scarlato (1981) described Dermatomya kurilensis Scarlato, 1981 , which was synonymized with Dermatomya tenuiconcha ( Dall, 1913) by Coan, Valentich-Scott & Bernard (2000). We compared the holotype of D. kurilensis (ZIN 10090) with the holotype of D. tenuiconcha (USNM 266865). They are virtually identical in shape and shell proportions. Therefore, we agree with Coan, Valentich-Scott & Bernard (2000) that D. kurilensis is a synonym of D. tenuiconcha . The species varies in shell height, so some specimens have a relatively more elongated shell compared to the type specimen. Our data has shown that D. tenuiconcha is widely distributed in the North Pacific and inhabits waters all along the Kuril Islands.

Figures

FIGURE 3. New and rare bivalve species for the fauna of the Kuril Islands. (A, B) Limatula attenuata (Iturup Island, 330 m, shell length 6.6 mm). (C, D) Limatula subauriculata (Iturup Island, 50 m, shell length 4.6 mm). (E, F) Musculus impressus (Urup Island, 123 m, shell length 17.7 mm). (G, H) Parvamussium intuscostatum (Onekotan Island, 146–147 m, shell length 17.2 mm). (I, J) Cardiomya cf. tosaensis (Urup Island, 100 m, shell length 7.8 mm). (K, L) Cetoconcha hyalina (Onekotan Island, 150–198 m, shell length 44.0 mm). (M, N) Dermatomya tenuiconcha (Simushir Island, 100 m, shell length 12.0 mm). (O, P) Poromya castanea (Iturup Island, 290 m, shell length 20.5 mm). (Q, R) Parvithracia sirenkoi (Paramushir Island, 400 m, shell length 7.0 mm). (S, T) Panomya ampla (Onekotan Island, 57 m, shell length 61.6 mm).