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Fusiform, robust body; snout conical, blunt, with nostrils on sides; mouth large, round; teeth on top jaw triangular, serrated; 5 large gill slits, all before pectoral fin; first dorsal fin large, triangular, origin over rear of base of pectoral fin; second dorsal fin very small; anal fin very small, origin under rear of base of second dorsal fin; tail almost symmetrical, half-moon shaped; tail base very depressed, with large keel that extends onto tail itself.