quadrimaculatus, Silurus Bloch [M. E.] 1794:37, Pl. 368 (fig. 2) [Naturgeschichte der ausländischen Fische v. 8; ref. 463] America [South America]. Holotype (unique): ZMB 2944 (probably lost). Type catalog: Type catalog: Silfvergrip & Paepke 1997:172 [ref. 24006], Ferraris 2007:200 [ref. 29155] On p. 28 of Bloch's Ichthyologie, v. 11 [ref. 21381]. •Valid as Pimelodus quadrimaculatus (Bloch 1794) -- (Ovchynnyk 1967:35 [ref. 37559] as quadromaculatus, Burgess 1989:280 [ref. 12860]). •Questionably the same as Rhamdia quelen (Quoy & Gaimard 1824) -- (Silfvergrip 1996:95 [ref. 22347], Bockmann & Guazzelli in Reis et al. 2003:424 [ref. 27061], Ferraris 2007:200 [ref. 29155]). Current status: Uncertain as Rhamdia quelen (Quoy & Gaimard 1824). Heptapteridae: Rhamdiinae. Habitat: freshwater, brackish.