Class Mammalia Linnaeus, 1758 - mammals
Subclass Theria Parker & Haswell, 1897
Infraclass Eutheria Gill, 1872
Magnorder Atlantogenata Waddell, Cao, Hasegawa & Mindell, 1999
Superorder Xenarthra Cope, 1889
Order Pilosa Flower, 1883 - sloths
Suborder Folivora Delsuc, Catzeflis, Stanhope & Douzery, 2001
Family Bradypodidae Batsch, 1788 - three-toed tree sloths