tenuis, Heptapterus Mees [G. F.] 1986:322, Figs. 3-4 [Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen (Series C, Biological and Medical Sciences) v. 89 (no. 3); ref. 5693] Creek Cascade Moyen, Maroni River, French Guiana. Holotype: RMNH 29422. Paratypes: RMNH 29288 (1). Type catalog: Ferraris 2007:184 [ref. 29155]. •Valid as Heptapterus tenuis Mees 1986 -- (Mees 1986:322 [ref. 5693], Burgess 1989:277 [ref. 12860], Le Bail et al. 2000:128 [ref. 24549], Bockmann & Guazzelli in Reis et al. 2003:413 [ref. 27061], Ferraris 2007:184 [ref. 29155], DoNascimiento 2016:539 [ref. 34727]). •Valid as Phenacorhamdia tenuis (Mees 1986) -- (DoNascimiento & Milani 2008:165 [ref. 29737], Silva 2020:281 [ref. 37978], Taphorn et al. 2022:49 [ref. 41297]). Current status: Valid as Phenacorhamdia tenuis (Mees 1986). Heptapteridae: Heptapterinae. Distribution: South America: Maroni/Marowijne River basin (French Guiana, Guyana and ?Venezuela). Habitat: freshwater.