assimilis, Arius Günther [A.] 1864:146 [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Lake Izabal [Yzabal], Guatemala. Holotype (unique): BMNH 1864.1.26.98. Type catalog: Ferraris 2007:33 [ref. 29155]. •Valid as Arius assimilis Günther 1864 -- (Villa 1982:114 [ref. 36708], Burgess 1989:168 [ref. 12860], Schmitter-Soto et al. 2000:151 [ref. 27754], Miller 2006:167 [ref. 28615], McEachran & Fechhelm 2005:16 [ref. 28815]). •Valid as Hexanematichthys assimilis (Günther 1864) -- (Marceniuk & Ferraris in Reis et al. 2003:451 [ref. 27061]). •Valid as Sciades assimilis (Günther 1864) -- (Marceniuk & Menezes 2007:104 [ref. 29031], Matamoros et al. 2009:10 [ref. 31241], Marceniuk et al. 2012:668 [ref. 32225], Angulo et al. 2013:993 [ref. 33194]). •Valid as Ariopsis assimilis (Günther 1864) -- (Greenfield & Thomerson 1997:82 [ref. 22947], Castro-Aguirre et al. 1999:156 [ref. 24550], Acero P. & Betancur-R. 2002:10 [ref. 26521], Acero P. 2003:838 [ref. 26998], Smith et al. 2003:11 [ref. 27621], Nelson et al. 2004:82 [ref. 27807], Kailola 2004:126 [ref. 28108], Ferraris 2007:33 [ref. 29155], Betancur-R. et al. 2007:348 [ref. 29268], Betancur-R. & Willink 2007:826 [ref. 29439], Page et al. 2013:82 [ref. 32708], Marceniuk et al. 2017:4 [ref. 35431], Raz-Guzmán et al. 2018:344 [ref. 36407], Angulo et al. 2023:28 [ref. 40676], Barrientos et al. 2023:272 [ref. 41235], Marceniuk et al. 2023:19 [ref. 40422], Page et al. 2023:78 [ref. 40505]). Current status: Valid as Ariopsis assimilis (Günther 1864). Ariidae: Ariinae. Distribution: Southern North America, central America: western Caribbean Sea watersheds (Quintana Roo, Mexico south to northwestern Honduras). Habitat: freshwater, brackish.