acutus, Corydoras Cope [E. D.] 1872:281 [Proceedings of the Academy of Natural Sciences of Philadelphia v. 23; ref. 921] Río Ambiyacu, Shansho Caño, Loreto, Peru. Neotype: CAS-SU 33307. Type catalog: Böhlke 1984:31 [ref. 13621], Ferraris 2007:112 [ref. 29155]. Neotype designated by Nijssen & Isbrücker 1980:215 [ref. 6910]; original syntypes ANSP 8292-8293 lost. •Valid as Corydoras acutus Cope 1872 -- (Ovchynnyk 1967:36 [ref. 37559], Nijssen & Isbrücker 1980:215 [ref. 6910], Ortega & Vari 1986:16 [ref. 9708], Burgess 1989:365 [ref. 12860], Isbrücker 1999:40 [ref. 24040], Isbrücker 2001:219 [ref. 26805], Reis in Reis et al. 2003:294 [ref. 27061], Barriga Salazar 2014:111 [ref. 35745], Tencatt et al. 2014:78 [ref. 33230], Sarmiento et al. 2014:190 [ref. 35004], 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], Tencatt & Ohara 2016:432 [ref. 34627], Ottoni et al. 2016:132 [ref. 34756], Meza-Vargas et al. 2021:24 [ref. 39298], Tencatt et al. 2021:8 [ref. 38289]). Current status: Valid as Corydoras acutus Cope 1872. Callichthyidae: Corydoradinae. Distribution: South America: Amazon River basin (northern Peru, Ecuador and Bolivia). Habitat: freshwater.