acrensis, Corydoras Nijssen [H.] 1972:416, Fig. 1 [Netherlands Journal of Zoology v. 21 (no. 4); ref. 673] Furo do Lago São Francisco, 7°40'S, 72°39'W, tributary at left bank of Rio Juruá, Acre State, Brazil. Holotype (unique): IRSNB 505. Type catalog: Walschaerts 1987:17 [ref. 20755], Ferraris 2007:112 [ref. 29155]. •Valid as Corydoras acrensis Nijssen 1972 -- (Nijssen & Isbrücker 1980:202 [ref. 6910], Burgess 1989:365 [ref. 12860], Isbrücker 2001:219 [ref. 26805], Reis in Reis et al. 2003:294 [ref. 27061], Ferraris 2007:112 [ref. 29155], Lima & Sazima 2017:30 [ref. 35111]). •Valid as Hoplisoma acrense (Nijssen 1972) -- (Dias et al. 2024:26 [ref. 41219] as acrensis). Current status: Valid as Hoplisoma acrense (Nijssen 1972). Callichthyidae: Corydoradinae. Distribution: South America: Juruá River basin, Brazil. Habitat: freshwater.