nudus, Gymnachirus Kaup [J. J.] 1858:101 [Archiv für Naturgeschichte v. 24 (pt. 1); ref. 2578] Bahía, Brazil. Holotype (unique): MNHN 0000-3313. Type catalog: Desoutter et al. 2001:317 [ref. 25922]. •Valid as Gymnachirus nudus Kaup 1858 -- (Matsuura in Uyeno et al. 1983:462 [ref. 14275], Cervigón 1992:439 [ref. 23827], Andreata & Séret 1996:590 [ref. 16204], Cervigón 1996:20 [ref. 24489], Aguilera 1998:53 [ref. 24221], Castro-Aguirre et al. 1999:498 [ref. 24550], Munroe 2003:1931 [ref. 27118], Ramos in Menezes et al. 2003:107 [ref. 27192], Nelson et al. 2004:182 [ref. 27807], McEachran & Fechhelm 2005:868 [ref. 28815], Page et al. 2013:188 [ref. 32708], Ribeiro et al. 2019:7 [ref. 36717], Robertson et al. 2020:150 [ref. 38098], Rotundo et al. in Marceniuk et al. 2021:401 [ref. 38945], Bitencourt et al. 2022:4 [ref. 39848], Carvalho-Filho 2023:266 [ref. 40480], Hoff et al. 2023:5 [ref. 40463]). Current status: Valid as Gymnachirus nudus Kaup 1858. Achiridae. Distribution: Western Atlantic: southern Gulf of Mexico (Mexico) south to Rio Grande do Sul (Brazil). Habitat: marine.