Distinguishing characteristics: black-coloured whales with a white belly, spherical melon and a robust body. No constriction at the neck and the body is quite cylindrical from the head backward to the region of the dorsal fin. Dorsal fin has a long base, it is low, directed backwards and is set for forward on the body. 8-13 teeth in each of the 4 jaws and flippers which are 1/5 of the body length.
- North-West Atlantic Ocean species (NWARMS) http://www.marinespecies.org/aphia.php?p=sourcedetails&id=2901