A rather stout, short-beaked (seldom more than 75 mm long) dolphin with sloping forehead and projecting lower jaw; dorsal fin high, falcate, and situated about midway from snout to flukes; pectoral fin broad at base, obtusely rounded at tip; upperparts plumbeous gray, more or less tinged with purplish, becoming black soon after death; sides pale gray, belly white; teeth 23/23, large, nearly round in cross section in adults, and conical; height above jawbone, 12-17 mm, diameter, 5-9 mm. Total length of adults may reach 3.5 m. A sub-adult male measured: total length, 2.9 m; length of pectoral fin, 39 cm; vertical height of dorsal fin, 23 cm.