microcephalus, Corydoras Regan [C. T.] 1912:211 [Annals and Magazine of Natural History (Series 8) v. 10 (no. 56); ref. 14865] La Plata, Buenos Aires, Argentina. Lectotype: BMNH 1890.3.12.4. Paralectotypes: BMNH 1890.3.12.5-6 (3). Type catalog: Ferraris 2007:122 [ref. 29155]. Lectotype selected by Nijssen & Isbrücker 1980:204 [ref. 6910]. •Synonym of Corydoras paleatus (Jenyns 1842) -- (Nijssen & Isbrücker 1980:204 [ref. 6910], Reis in Reis et al. 2003:301 [ref. 27061], Ferraris 2007:122 [ref. 29155], Mirande & Koerber 2015:40 [ref. 35117]). •Doubtful species -- (Isbrücker 2001:230 [ref. 26805]). •Valid as Corydoras microcephalus Regan 1912 -- (Knaack 2007:29 [ref. 29220], Tencatt et al. 2016:[10] [ref. 34388]). •Valid as Hoplisoma microcephalum (Regan 1912) -- (Dias et al. 2024:27 [ref. 41219]). Current status: Valid as Hoplisoma microcephalum (Regan 1912). Callichthyidae: Corydoradinae. Distribution: South America: Argentina. Habitat: freshwater.