sapo, Pimelodus Valenciennes [A.] 1835:Pl. 2 (figs. 6-8) [Voyage dans l'Amérique méridionale; ref. 20720] Buenos Aires, Argentina. Holotype (unique): MNHN 0000-1576. Type catalog: Bertin & Estève 1950:56 [ref. 19575], Ferraris 2007:200 [ref. 29155] Name available from plate, description in Valenciennes 1847:7 [ref. 5010] with wrong plate number. See also Cuvier & Valenciennes 1840:179 [ref. 1008]. See Gómez & Chebez 1996:59 [ref. 23791]. Pl. 2 was published in 1835. •Mention -- (Malabarba 1989:144 [ref. 14217]). •Valid as Rhamdia sapo (Valenciennes 1835) -- (Burgess 1989:279 [ref. 12860], Haro et al. 1996:6 [ref. 25004], Mabragaña et al. 2011:table S2 [ref. 31800]). •Synonym of Rhamdia quelen (Quoy & Gaimard 1824) -- (Silfvergrip 1996:95 [ref. 22347], Bockmann & Guazzelli in Reis et al. 2003:424 [ref. 27061], López et al. 2003:63 [ref. 27366], Casciotta et al. 2003:139 [ref. 28130], Menni 2004:83 [ref. 28131], Ferraris 2007:200 [ref. 29155], Litz & Koerber 2014:21 [ref. 33622], Mirande & Koerber 2015:34 [ref. 35117], Koerber et al. 2017:52 [ref. 35267]). Current status: Synonym of Rhamdia quelen (Quoy & Gaimard 1824). Heptapteridae: Rhamdiinae. Habitat: freshwater, brackish.