The seal
shark has two, spineless dorsal fins that are almost
equal in size (the first is slightly smaller). The snout
is short and blunt, the lips are thick, and the lower
lobe of the caudal fin is not greatly expanded. The
first dorsal fin origin is well behind the pectoral
fin rear tips and its base is relatively narrow. The
coloration is grayish, brown or brownish-black. This
shark has a very large liver and is thought to be neutrally
buoyant.
