isotrachys, Raja Günther [A.] 1877:434 [Annals and Magazine of Natural History (Series 4) v. 20 (no. 119) (art. 56); ref. 2009] Coast of southern Japan, Challenger station 235, depth 565 fathoms. Holotype (unique): BMNH 1887.12.7.3. Also described as new in Günther 1887: 7, Pl. 3 [ref. 2013]. •Valid as Bathyraja isotrachys (Günther 1877) -- (Nakaya in Masuda et al. 1984:14 [ref. 6441], Dolganov 1985:423 [ref. 8163], Stehmann 1986:263 [ref. 6151], McEachran & Dunn 1998:286 [ref. 23312], Dolganov 1999:429 [ref. 24873], Jeong 1999:201 [ref. 25171], Compagno 1999:488 [ref. 25589], Nakabo 2000:169 [ref. 25086], Sheiko & Fedorov 2000:15 [ref. 25650], Nakabo 2002:169 [ref. 26001], Choi et al. 2003:66, 482 [ref. 26218], Fedorov et al. 2003:17 [ref. 27579], Stevenson et al. 2004:312 [ref. 27688], Shinohara et al. 2005:397 [ref. 28370], Stehmann 2005:S35 [ref. 28647], Stehmann 2005:S53 [ref. 28648], Shao et al. 2008:237 [ref. 29952], Parin et al. 2014:31 [ref. 33547], Dyldin 2015:64 [ref. 34524], Weigmann 2016:93 [ref. 34211], Last et al. 2016:25 [ref. 34941], Last et al. 2016:389 [ref. 35005], Dyldin & Orlov 2018:169 [ref. 35920], Dyldin & Orlov 2021:58 [ref. 38158], Orlov & Volvenko 2022:3 [ref. 39982]). Current status: Valid as Bathyraja isotrachys (Günther 1877). Arhynchobatidae. Distribution: Northwestern Pacific. Habitat: marine.