Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Order Sirenia Gill, 1872 - sea cows Family Dugongidae Gray, 1821 - dugong and sea cow Subfamily Dugonginae Gray, 1821 Genus Dugong Lacépède, 1799 - dugong Dugong dugon (P.L.S. Müller, 1776) - dugong