villosus" is found in the Demerara River of the Essequibo basin, Orinoco, and Amazon River basins.Species of this genus have rounded, wider than deep bodies; large heads, rounded in dorsal view; pelvic fins originating at vertical line through the end of the dorsal fin; short caudal peduncles, with caudal fin procurrent rays close to adipose and anal fins; emarginated caudal fins, with rounded lobes, or completely rounded; incomplete lateral lines, sometimes surpassing the adipose-fin end, but never reaching the caudal fin.