nuptial males and an emarginate caudal fin, while L. tentaculatus has tentacles along the anterior margin of the snout in nuptial males and a forked caudal fin. In the remaining two species, the abdomen has plates in at least a small patch medial to the insertion of the pectoral-fin spines; in L. heteracanthus, the abdomen has plates underneath entire pectoral girdle and on the abdomen, while in L. guacharote, the abdomen has only a couple of plates medial to insertion of pectoral-fin spines. References Ancistrini Fish of South America Catfish genera Taxa named by Charles Tate Regan Freshwater fish genera