Cardiomya tosaensis A. Adams 1864

Cardiomya cf. tosaensis (Kuroda, 1948) (Fig. 3 I, J) Cuspidaria (Cardiomya) tosaensis Kuroda, 1948: 18, plate 2, fig. 13. Cardiomya tosaensis (Kuroda, 1948) — Higo, Callomon & Goto 2001: 185, fig. B1454. Material examined: 24 specimens from the ocean and sea slopes of Kunashir, Iturup, Urup, Broutona, and Onekotan Islands (90–460 m). Distribution: East China Sea; Sea of Japan; Boso Peninsula (eastern Honshu) to west coast of Kyushu, Japan; Kuril Islands (28–800 m) (Kuroda 1948; Okutani & Sakurai 1964; Scarlato 1981; Okutani 2006, 2017; Kamenev 2013). Remarks: This is a new record from the region of the Kuril Islands. The specimens we examined are similar to the holotype of Cardiomya tosaensis (Kuroda, 1948) (Kuroda 1948; Higo, Callomon & Goto 2001). Scarlato (1972) described Cardiomya lindbergi batialis Scarlato, 1972, which was found in the Sea of Japan at depths of 100–800 m (Scarlato 1981). Сurrently, С. lindbergi batialis is accepted as C. tosaensis by Huber (2010) and Kamenev (2013). Indeed, С. lindbergi batialis is similar in shell morphology to C. tosaensis. However, given the brief description of both species, we think that further study of the species is needed to clarify the taxonomic status of С. lindbergi batialis.