Huxleyia pentadonta Scarlato, 1981

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 : 238

Huxleyia pentadonta Scarlato, 1981

( Fig. 2 M, N )

Huxleyia pentadonta Scarlato, 1981: 215 , fig. 117.

Material examined: nine specimens from the ocean and sea slopes of Paramushir Island (214–804 m) .

Distribution: northern Kuril Islands (Paramushir and Shumshu Islands) (67–804 m) ( Scarlato 1981; Kantor & Sysoev 2005).

Remarks: Previously, this species was found only in one sample (two specimens) collected from off Shumshu Island at a depth of 67 m ( Scarlato 1981). Huxleyia pentadonta Scarlato, 1981 , is very similar in shell shape to Huxleyia munita ( Dall, 1898) from the northeastern Pacific but has 5 hinge teeth ( Scarlato 1981) whereas H. munita has 6 hinge teeth ( Coan, Valentich-Scott & Bernard 2000). The left valve of a specimen of H. munita in a photograph given in Coan, Valentich-Scott & Bernard (2000), however, has also 5 hinge teeth. Therefore, we think that the hinge of H. munita needs to be studied more thoroughly. It is quite possible that H. pentadonta turns out to be a synonym of H. munita .

Figures

FIGURE 2. New and rare bivalve species for the fauna of the Kuril Islands. (A, B) Acila divaricata (Kunashir Strait, 200 m, shell length 29.7 mm). (C, D) Acila insignis (Yuri Island, 1000 m, shell length 11.0 mm). (E, F) Nuculana ensiformis (Shikotan Island, 200 m, shell length 22.5 mm). (G, H) Poroleda ushakovi (Shumshu Island, 820 m, shell length 17.1 mm). (I, J) Robaia robai (Kunashir Strait, 300 m, shell length 16.3 mm). (K, L) Yoldia hyperborea (Paramushir Island, 215 m, shell length 19.0 mm). (M, N) Scanning electron micrographs of Huxleyia pentadonta (Paramushir Island, 214 m, shell length 2.3 mm). (O, P) Samacar kurilensis (Iturup Island, 265–270 m, shell length 16.5 mm). (Q, R) Tetrarca boucardi (Shpanberg Strait, 55 m, shell length 20.0 mm). (S, T) Limopsis oliveri (Urup Island, 50 m, shell length 9.0 mm). (U, V) Limopsis vaginata (Iturup Island, 600 m, shell length 26.3 mm).