zygatus, Corydoras Eigenmann [C. H.] & Allen [W. R.] 1942:175, Pl. 12 (fig. 1) [Fishes of western South America; ref. 1246] Río Hallagua system, Yurimaguas (5°54'S, 76°04'W), Loreto, Peru. Holotype: CAS 24756 [ex IU 15704]. Paratypes: CAS 24757 [ex IU 15704] (7). Type catalog: Ferraris 2007:126 [ref. 29155]. We treat the species epithet (= yoke-shaped) as a declinable adjective. •Valid as Corydoras zygatus Eigenmann & Allen 1942 -- (Nijssen & Isbrücker 1980:210 [ref. 6910], Ortega & Vari 1986:16 [ref. 9708], Burgess 1989:367 [ref. 12860], Isbrücker 2001:238 [ref. 26805], Reis in Reis et al. 2003:304 [ref. 27061], Shimabukuro-Dias et al. 2004:141 [ref. 27796], Ferraris 2007:126 [ref. 29155], Tencatt et al. 2013:258 [ref. 32752], Barriga Salazar 2014:111 [ref. 35745], Tencatt & Pavanelli 2015:294 [ref. 35434], Ottoni et al. 2016:133 [ref. 34756] as zigatus, Tencatt & Evers 2016:[12] [ref. 34387], Tencatt & Ohara 2016:[13] [ref. 34353], Tencatt et al. 2016:[18] [ref. 34388], DoNascimiento et al. 2017:73 [ref. 35633], Meza-Vargas et al. 2021:25 [ref. 39298]). •Valid as Osteogaster zygata (Eigenmann & Allen 1942) -- (Dias et al. 2024:24 [ref. 41219] as zygatus). Current status: Valid as Osteogaster zygata (Eigenmann & Allen 1942). Callichthyidae: Corydoradinae. Distribution: South America: Amazon River basin (Brazil, Colombia, Ecuador and Peru). Habitat: freshwater.