nielseni, Pseudoxenomystax Karmovskaya [E. S.] 1990:770 [8], Figs. 1c, 2d [Voprosy Ikhtiologii v. 30 (no. 5); ref. 20148] Eastern Pacific, 22°05'S, 81°15'W, depth 230 meters. Holotype: ZIN 49433. Paratypes: AMS I.28704-001 (1); IOM uncat. (2, 2); ZMMU P-18049 (1); ZIN 49434 (1). Type catalog: Vasil'eva et al. 2001:17 [ref. 25714]. On p. 8 of English translation. •Valid as Pseudoxenomystax nielseni Karmovskaya 1990 -- (Pequeño 1997:80 [ref. 23536]). •Valid as Bassanago nielseni (Karmovskaya 1990) -- (Andrew et al. 1995:9 [ref. 38009], Caires & Figueiredo 2011:370 [ref. 31202] as not confirmed in Brazil). Current status: Valid as Bassanago nielseni (Karmovskaya 1990). Congridae: Congrinae. Distribution: Southeastern Pacific: Chile; southern-central Atlantic: Tristan da Cunha Group. Habitat: marine.