gracilis, Corydoras Nijssen [H.] & Isbrücker [I. J. H.] 1976:91, Figs. [Tropical Fish Hobbyist v. 25 (no. 1); ref. 7380] Rio Jauna (= River Juma) at Trans-Amazonica highway, about 6°09'S, 59°55'W, tributary of Rio Aripuaña, Amazonas, Brazil (corrected locality). Holotype: ZMA 114687. Paratypes: BMNH 1976.4.27.143 (1); USNM 216074 (1); ZMA 114688-89 (1, 1); ZMH H5688 (1). Type catalog: Wilkens 1977:159 [ref. 22013], Nijssen et al. 1982:45 [ref. 19236], Ferraris 2007:118 [ref. 29155]. Type locality corrected in Nijssen & Isbrücker 1980:214 [ref. 6910], Ferraris & Vari 1992:14 [ref. 19771]. •Valid as Corydoras gracilis Nijssen & Isbrücker 1976 -- (Nijssen & Isbrücker 1980:214 [ref. 6910], Burgess 1989:366 [ref. 12860], Isbrücker 2001:226 [ref. 26805] with different locality, Reis in Reis et al. 2003:298 [ref. 27061], Ferraris 2007:118 [ref. 29155], Britto et al. 2009:687 [ref. 30609], Tencatt & Ohara 2016:[12] [ref. 34353], Ohara et al. 2016:548 [ref. 34772], Bono et al. 2019:20 [ref. 36480], Tencatt et al. 2019:[14] [ref. 36697]). •Valid as Gastrodermus gracilis -- (Dias et al. 2024:24 [ref. 41219]). Current status: Valid as Gastrodermus gracilis (Nijssen & Isbrücker 1976). Callichthyidae: Corydoradinae. Distribution: South America: middle and lower Amazon River basin, Brazil. Habitat: freshwater.