Widely distributed deep-sea bivalve species of the North Pacific: (A–B) Delectopecten vancouverensis, Sea of Japan, 2,700–3,100 m, 15.7 mm shell length; (C–D) Catillopecten squamiformis, Bering Sea, 3,957–3,978 m, 10.1.mm shell length; (E–F) Parvamussium pacificum, abyssal plain adjacent to Kuril-Kamchatka Trench, Pacific Ocean, 5,398–5,389 m, 8.5 mm shell length; (G) Vesicomya pacifica, Sea of Okhotsk, 3,351–3,353 m, 5.2 mm shell length; (H) Vesicomya profundi, Kuril-Kamchatka Trench, 8,240–8,345 m; (I) Vesicomya sergeevi, Kuril-Kamchatka Trench, 9,170–9,335 m; (J–K) Bathyneaera hadalis, Kuril-Kamchatka Trench, 8,740–8,735 m, 10.0 mm shell length; (L–M) Macoma shiashkotanika, Bering Island, Commander Islands, Bering Sea, 1,490 m, 9.3 mm shell length; (N) Adontorhina cyclia, Sea of Japan, 970–1,075 m, Scale bars: (H) = 500 µm; (I) = 1 mm; (N) = 200 μm.