longicauda, Imparfinis Borodin [N. A.] 1927:4, Fig. 3 [American Museum Novitates No. 266; ref. 12246] Franca, Rio Grande, Province of São Paulo, southeastern Brazil. Holotype (unique): AMNH 8639. Type catalog: Ferraris 2007:185 [ref. 29155] Secondarily preoccupied in Imparfinis by Pimelodus longicauda Boulenger 1887; replaced by Imparfinis borodini Mees & Cala 1989. But now, both species are in different genera and both names are no longer secondary homonyms. •Treated as valid -- (Burgess 1989:277 [ref. 12860]). •Synonym of Imparfinis borodini Mees & Cala 1989 -- (Mees & Cala 1989:383 [ref. 14277], Bockmann & Guazzelli in Reis et al. 2003:414 [ref. 27061], Ferraris 2007:185 [ref. 29155]). •Valid as Heptapterus longicauda (Borodin 1927) -- (Deprá et al. 2023:149 [ref. 39829]). Current status: Valid as Heptapterus longicauda (Borodin 1927). Heptapteridae: Heptapterinae. Distribution: South America: upper Paraná, São Francisco and Tocantins River basins (Brazil). Habitat: freshwater.