Fifth gill slit is shorter than 4 preceding ones and located posterior to pectoral fin base. Flattened head extending to hammer-like lobes on each side. Distinct indentation of the front margin of the head at its midpoint. Second dorsal fin longer than tail. Gray-brown to olive in color with white underbelly. Teeth smooth-edged. Pectoral fins tipped with black on the undersurface. Tips of first and second dorsal lobes and caudal also may have dusky tips. Pelvic fin with nearly straight hind margin.