tenuis, Opisthocentrus Bean [T. H.] & Bean [B. A.] 1897:463, Pl. 35 [Proceedings of the United States National Museum v. 20 (no. 1127); ref. 14622] Uchiura [Volcano] Bay, Port Muroran, Hokkaido, Japan. Holotype (unique): USNM 47565. Type catalog: Springer & Anderson 1997:13 [ref. 22953]. •Valid as Opisthocentrus tenuis Bean & Bean 1897 -- (Amaoka & Miki in Masuda et al. 1984:302 [ref. 6441], Shiogaki 1984:222 [ref. 5309], Sokolovskaya et al. 1998:12 [ref. 24670], Nakabo 2000:1052 [ref. 25182], Nakabo 2002:1052 [ref. 26193], Choi et al. 2003:377, 643 [ref. 26218], Mecklenburg & Sheiko 2004:9 [ref. 27604], Parin et al. 2014:447 [ref. 33547], Kim et al. 2020:157 [ref. 39118], Dyldin & Orlov 2021:852 [ref. 38925], Dyldin et al. 2021:53 [ref. 38804]). Current status: Valid as Opisthocentrus tenuis Bean & Bean 1897. Opisthocentridae. Distribution: Northwestern Pacific: Sea of Japan (Korea, Japan, Russia) and Pacific coast of Hokkaido to central Honshu (Japan); Sakhalin (Russia). Habitat: marine.