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
Family Trichechidae Gill, 1872 - manatees