Eubalaena australis (Desmoulins 1822; 15-18 m in length; extant) is the Southern right whale. Derived from a sister to Caperea and Desmostylus, the giant mouth is much deeper than in Balaeonoptera, with longer baleen. The skull is relatively larger and the postcrania shorter and deeper with relatively larger fins. Five digits are present on the manus. The mandible moves relatively little. The lower lip rises to meet the upper jaw. The cervical series is tightly interwoven.