Araranguá basin

Scleromystax salmacis is a small armoured catfish known only from the rios Mampituba and Araranguá in Santa Catarina state, southern Brazil. It is most similar to S. macropterus but lacks a black spot at the base of the median caudal-fin rays and has more irregular transverse blotches. The dorsal and pectoral fins are equal in length in both sexes, and the type locality was a small, clear, slow-moving pool over mud-covered rock.