stenocephalus, Corydoras Eigenmann [C. H.] & Allen [W. R.] 1942:177, Pl. 12 (fig. 2) [Fishes of western South America; ref. 1246] Lake Yarinococha (8°15'S, 74°45'W), Río Ucayali system, Loreto, Peru. Holotype (unique): CAS 36386 [ex IU 15817 and CAS 15817]. Type catalog: Ferraris 2007:125 [ref. 29155]. •Synonym of Corydoras acutus Cope 1872 -- (Nijssen & Isbrücker 1980:215 [ref. 6910]). •Valid as Corydoras stenocephalus Eigenmann & Allen 1942 -- (Burgess 1989:367 [ref. 12860], Isbrücker 1999:40 [ref. 24040], Isbrücker 2001:236 [ref. 26805], Reis in Reis et al. 2003:303 [ref. 27061], Ferraris 2007:125 [ref. 29155], Barriga Salazar 2014:111 [ref. 35745], Sarmiento et al. 2014:190 [ref. 35004], Tencatt et al. 2014:78 [ref. 33230], Tencatt & Evers 2016:[12] [ref. 34387], Tencatt & Ohara 2016:[13] [ref. 34353], Tencatt et al. 2016:[18] [ref. 34388], Meza-Vargas et al. 2021:25 [ref. 39298]). Current status: Valid as Corydoras stenocephalus Eigenmann & Allen 1942. Callichthyidae: Corydoradinae. Distribution: South America: upper Amazon basin (Bolivia, Ecuador and Peru). Habitat: freshwater.