leptos, Acentronichthys Eigenmann [C. H.] & Eigenmann [R. S.] 1889:29 [Proceedings of the California Academy of Sciences (Series 2) v. 2; ref. 1253] Rio São Mateos at São Mateos [= São Mateus], Espírito Santo State, Brazil. Holotype (unique): MCZ 7532. Type catalog: Ferraris 2007:180 [ref. 29155]. •Valid as Heptapterus leptos (Eigenmann & Eigenmann 1889) -- (Burgess 1989:276 [ref. 12860]). •Valid as Acentronichthys leptos Eigenmann & Eigenmann 1889 -- (Bockmann & Guazzelli in Reis et al. 2003:410 [ref. 27061], Ferraris 2007:180 [ref. 29155], Di Dario et al. 2013:262 [ref. 37503], Faustino-Fuster et al. 2019:369 [ref. 36604], Reis et al. 2020:465 [ref. 38364], Silva et al. 2020:10 [ref. 37809]). Current status: Valid as Acentronichthys leptos Eigenmann & Eigenmann 1889. Heptapteridae: Heptapterinae. Distribution: South America: coastal streams of southeastern Mata Atlantica (Brazil). Habitat: freshwater.