japonica, Gengea Katayama [M.] 1943:101, Fig. 1 [Annotationes Zoologicae Japonenses v. 22 (no. 2); ref. 2567] Moroyose, Hyogo-ken, Japan. Holotype (unique): whereabouts unknown. •Valid as Gengea japonica Katayama 1943 -- (Lindberg & Krasyukova 1975:180 [ref. 7348]). •Synonym of Gymnelopsis ochotensis (Popov 1931) -- (Anderson 1982:51 [ref. 5520], Anderson 1994:116 [ref. 21438], Anderson & Fedorov 2004:4 [ref. 27603]). •Valid as Derjuginia japonica (Katayama 1943) -- (Toyoshima in Masuda et al. 1984:306 [ref. 6441], Nakabo 2000:1042 [ref. 25182], Nakabo 2002:1042 [ref. 26193], Shinohara et al. 2011:51 [ref. 31715], Balushkin 2011:960 [ref. 32449], Shinohara et al. 2014:264 [ref. 33330]). •Valid as Gymnelopsis japonica (Katayama 1943) -- (Dyldin & Orlov 2021:844 [ref. 38925]). •Valid as Gymnelopsis japonicus (Katayama 1943) -- (Nazarkin & Chernova 2003:605 [ref. 27204], Parin et al. 2014:390 [ref. 33547]). Current status: Valid as Gymnelopsis japonica (Katayama 1943). Zoarcidae: Gymnelinae. Distribution: Northwestern Pacific. Habitat: marine.