melanopus, Arius Günther [A.] 1864:172 [Catalogue of the fishes in the British Museum v. 5; ref. 1974] Río Motagua, Guatemala. Syntypes: (2?) BMNH 1865.4.29.51-53 (3). Type catalog: Ferraris 2007:40 [ref. 29155]. •Valid as Arius melanopus Günther 1864 -- (Villa 1982:115 [ref. 36708], Burgess 1989:169 [ref. 12860]). •Valid as Cathorops melanopus (Günther 1864) -- (Castro-Aguirre et al. 1999:147 [ref. 24550], Acero P. 2003:837 [ref. 26998], Marceniuk & Ferraris in Reis et al. 2003:449 [ref. 27061], Nelson et al. 2004:83 [ref. 27807], Kailola 2004:132 [ref. 28108], Betancur-R. & Acero P. 2005:54 [ref. 28341], McEachran & Fechhelm 2005:16 [ref. 28815], Marceniuk & Menezes 2007:45 [ref. 29031], Ferraris 2007:40 [ref. 29155], Betancur-R. et al. 2007:349 [ref. 29268], Betancur-R. & Willink 2007:826 [ref. 29439], Marceniuk & Betancur-R. 2008:39 [ref. 29576], Matamoros et al. 2009:9 [ref. 31241], Marceniuk et al. 2012:93 [ref. 31865], Raz-Guzmán et al. 2018:344 [ref. 36407], Angulo et al. 2023:29 [ref. 40676], Barrientos et al. 2023:272 [ref. 41235], Marceniuk et al. 2023:13 [ref. 40422]). Current status: Valid as Cathorops melanopus (Günther 1864). Ariidae: Ariinae. Distribution: Central America: Montagua River basin (Guatemala and Nicaragua). Habitat: freshwater.