Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Infraclass Eutheria Gill, 1872
       Magnorder Atlantogenata Waddell, Cao, Hasegawa & Mindell, 1999
         Superorder Afrotheria Stanhope, Waddell, Madsen, de Jong, Hedges, Cleven, Kao & Springer, 1998
           Order Sirenia Gill, 1872 - sea cows
             1 Family Dugongidae Gray, 1821 - dugong and sea cow
             2 Family Trichechidae Gill, 1872 - manatees