Acila insignis (Gould, 1861)

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 : 235

Acila insignis (A. Gould, 1861)

( Fig. 2 C, D )

Nucula (Acila) insignis A. Gould, 1861: 36.

Acila (Truncacila) insignis ( Gould, 1861) — Lutaenko & Noseworthy 2012: 21, pl. 1, figs. G–J, text-fig. 3.

Material examined: 12 specimens from the Kunashirsky Strait (50– 1,000 m).

Distribution: Yellow Sea; Sea of Japan; Kuril Islands (Kunashir Island (Izmena Bay)), Kunashirsky Strait (5– 1,000 m) ( Scarlato 1981; Evseev 2000; Kurozumi & Tsuchida 2000, 2017; Kantor & Sysoev 2005; Lutaenko & Noseworthy 2012; Lee 2014).

Remarks: The finding of this species in Izmena Bay (Kunashir Island) was only briefly mentioned by Evseev (2000). In other parts of its range, it was found only to a depth of 650 m ( Lee 2014).

Acila insignis well differs from Acila divaricata by the absence of a distinct radial fold and a rostrum at the posterior end of the shell.

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).