Dorsal fin origin above the 3rd and 4th anal-fin ray; pectoral fin large with dark distal margin, extending beyond tip of pelvic fin; 31-33 branched anal-fin rays; dark outline on first few lateral canals; 20-21 gill rakers on 1st arch (Ref. 12693). Abdomen more or less greatly arched, with a sharp keel. Lower jaw with a symphyseal knob fitting into an emargination of symphysis of upper jaw. No barbels. Lateral line greatly recurved (Ref. 4792).