Figure 1. Widely distributed deep-sea bivalve species of the North Pacific: (A–B) Ledellina convexirostrata, Kuril-Kamchatka Trench, 6,551–6,560 m; (C–D) Nuculana leonina, Bering Sea, 2,622–3,034 m, 23.6 mm shell length; (E–F) Poroleda extenuata, Kuril Islands, Pacific Ocean, 3,342–3,432 m, 24.0 mm shell length; (G–H) Katadesmia vincula, Sea of Okhotsk, 3,351–3,353 m, 14.9 mm shell length; (I–J) Parayoldiella ultraabyssalis, Kuril-Kamchatka Trench, 9,294–9,431 m; (K) Bathyspinula calcarella, abyssal plain adjacent to Kuril-Kamchatka Trench, Pacific Ocean, 5,417–5,422 m, 15.4 mm shell length; (L) Bathyspinula vityazi, Kuril-Kamchatka Trench, 7,955–8,015 m, 15.0 mm shell length; (M–N) Dacrydium rostriferum, abyssal plain adjacent to Kuril-Kamchatka Trench, Pacific Ocean, 5,290–5,427 m; (O–P) Dacrydium vitreum, Sea of Japan, 970–1,075 m; (Q–R) Bathyarca imitata, Sea of Okhotsk, 3,305–3,307 m, 6.8 mm shell length. Scale bars: (A–B, I–J, M–N) = 500 µm; (O–P) = 200 μm.