Snout is short. Mouth triangular with rudimentary or no labial furrows. Eyes large with moderately large spiracle. Anterior nasal flaps are short. First and second dorsal fins are fairly large and high, almost the same size. First dorsal fin set back at low angle to body axis, its origin almost over pectoral fin insertions. Anal fin height is less than half height of first and second dorsal fins. Caudal fin long and ribbon-like.