ambiacus, Corydoras Cope [E. D.] 1872:280 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 23; ref. 921] Río Ambyiacu, Peru. Holotype (unique): ANSP 8291. Type catalog: Böhlke 1984:31 [ref. 13621], Ferraris 2007:113 [ref. 29155]. •Valid as Corydoras ambiacus Cope 1872 -- (Nijssen & Isbrücker 1980:194 [ref. 6910], Ortega & Vari 1986:16 [ref. 9708], Burgess 1989:365 [ref. 12860], Isbrücker 2001:220 [ref. 26805], Reis in Reis et al. 2003:294 [ref. 27061], Ferraris 2007:113 [ref. 29155], Barriga Salazar 2014:111 [ref. 35745], Tencatt & Pavanelli 2015:294 [ref. 35434], Tencatt & Ohara 2016:[12] [ref. 34353], Tencatt & Evers 2016:[11] [ref. 34387], Tencatt et al. 2016:[16] [ref. 34388], DoNascimiento et al. 2017:72 [ref. 35633], Grant 2021:30 [ref. 38454], Meza-Vargas et al. 2021:25 [ref. 39298]). Current status: Valid as Corydoras ambiacus Cope 1872. Callichthyidae: Corydoradinae. Distribution: South America: upper Amazon River basin (Brazil, Ecuador, Colombia and Peru). Habitat: freshwater.