caeluronigricans, Bathyraja Ishiyama [R.] & Ishihara [H.] 1977:74, Figs. 9a-b [Japanese Journal of Ichthyology v. 24 (no. 2); ref. 5401] Off Hachinoche, Japan, 41°00'N, 142°00'E, depth 200-400 meters. Holotype: MTUF 21803. Paratypes: MTUF 21804-16 (13). •Valid as Bathyraja caeluronigricans Ishiyama & Ishihara 1977 -- (Nakaya in Amaoka et al. 1983:57, 169, 223, 311 [ref. 8379], Nakaya in Masuda et al. 1984:14 [ref. 6441], Stehmann 1986:263 [ref. 6151] as caerulonigricans, McEachran & Dunn 1998:286 [ref. 23312], Compagno 1999:488 [ref. 25589], Stehmann 2005:S35 [ref. 28647], Stehmann 2005:S53 [ref. 28648], Dyldin 2015:62 [ref. 34524]). •Questionably a synonym of Bathyraja matsubarai (Ishiyama 1952) -- (Sheiko & Fedorov 2000:15 [ref. 25650], Dyldin & Orlov 2018:170 [ref. 35920]). •Synonym of Bathyraja matsubarai (Ishiyama 1952) -- (Weigmann 2016:94 [ref. 34211], Last et al. 2016:26 [ref. 34941]). Current status: Synonym of Bathyraja matsubarai (Ishiyama 1952). Arhynchobatidae. Habitat: marine.