Total length 1.4-1.7 m.
One of the smaller cetaceans. The only true porpoise with no dorsal fin. In
its place a series of tubercles runs down the back. Body colour is pale grey
with a blue tinge on the back and sides, with off-white ventral regions.
(The body colour only becomes black after death.) Tail flukes have slightly
rounded tips and a well-defined notch. Flippers are long, broad and pointed
at the tips. Tooth counts range from 13 to 22 pairs in each jaw.