atrarius, Xenomystax Gilbert [C. H.] 1891:348 [Proceedings of the United States National Museum v. 14 (no. 856); ref. 1625] Off Ecuador, 0°37'00"S, 81°00'00"W, Albatross station 2792, depth 401 fathoms. Holotype (unique): USNM 44369. Type catalog: Smith 1994:12 [ref. 21917]. •Valid as Xenomystax atrarius Gilbert 1891 -- (Seigel 1987:57 [ref. 23111], Smith 1989:559 [ref. 13285], Pequeño 1989:25 [ref. 14125], McAllister 1990:49 [ref. 14674], Smith in Fischer et al. 1995:1035 [ref. 22829], Grove & Lavenberg 1997:180 [ref. 24023], Chirichigno F. & Vélez D. 1998:131 [ref. 24555], Love et al. 2005:23 [ref. 37547], McCosker & Rosenblatt 2010:189 [ref. 30957], Robertson et al. 2017:32 [ref. 35676], Smith et al. 2017:42 [ref. 36260], Love et al. 2021:39 [ref. 39279], Page et al. 2023:57 [ref. 40505]). Current status: Valid as Xenomystax atrarius Gilbert 1891. Congridae: Congrinae. Distribution: Eastern Pacific: British Columbia (Canada) south to Chile, including Gulf of California (Mexico) and Galápagos Islands (Ecuador). Habitat: marine.