piperatus, Imparfinis Eigenmann [C. H.] & Norris [A. A.] 1900:352 [Revista do Museu Paulista v. 4; ref. 1264] São Paulo State, Brazil. Holotype (unique): CAS 63636 [ex IU 9298]. Type catalog: Ferraris 2007:186 [ref. 29155]. •Valid as Imparfinis piperatus Eigenmann & Norris 1900 -- (Mees & Cala 1989:382 [ref. 14277], Burgess 1989:277 [ref. 12860], Bockmann & Guazzelli in Reis et al. 2003:414 [ref. 27061], Ferraris 2007:186 [ref. 29155], Ortega-Lara et al. 2011:778 [ref. 31716], Castro & Wosiacki 2019:471 [ref. 37139], Silva et al. 2023:368 [ref. 40041]). Current status: Valid as Imparfinis piperatus Eigenmann & Norris 1900. Heptapteridae: Heptapterinae. Distribution: South America: Rio Tietê and Paraíba do Sul basins, São Paulo State, Brazil. Habitat: freshwater.