pristos, Imparfinis Mees [G. F.] & Cala [P.] 1989:391, Fig. 3 [Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen (Series C, Biological and Medical Sciences) v. 92 (no. 3); ref. 14277] Second tributary, left side, from mouth of Río Tomo, Vichada, Colombia. Holotype: ICNMHN 1401. Paratypes: ICNMHN 1402 (4); RMNH 30544 (5). Type catalog: Ferraris 2007:186 [ref. 29155], Mojica & Agudelo-Zamora 2018:46 [ref. 36127]. •Valid as Imparfinis pristos Mees & Cala 1989 -- (Burgess & Finley 1996:166 [ref. 22901], Bockmann & Guazzelli in Reis et al. 2003:414 [ref. 27061], Ferraris 2007:186 [ref. 29155], Ortega-Lara et al. 2011:791 [ref. 31716], DoNascimiento et al. 2017:90 [ref. 35633], Castro & Wosiacki 2019:471 [ref. 37139], Cortés-Hernández et al. 2023:13 [ref. 40341]). Current status: Valid as Imparfinis pristos Mees & Cala 1989. Heptapteridae: Heptapterinae. Distribution: South America: Orinoco and Amazon River basins: Brazil, Colombia and Venezuela. Habitat: freshwater.