The pectoral fins are large and broad, with rounded margins. The first dorsal fin is fairly angular and originates over the middle of the pelvic fin bases. The second dorsal fin is much smaller and lower than the first, originating behind the anal fin origin. The pelvic fins are small, with elongate, relatively short claspers in males. The anal fin is substantially larger and deeper than the second dorsal fin. The caudal fin is deep, with a distinct lower lobe and a strong ventral notch near the tip of the upper lobe. The body is densely covered by minute dermal denticles, each shaped like an arrowhead and bearing a median ridge.