Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Pilosa Flower, 1883 - sloths
       Suborder Folivora Delsuc, Catzeflis, Stanhope & Douzery, 2001
         1 Family Bradypodidae Batsch, 1788 - three-toed tree sloths
         2 Family Megalonychidae Gervais, 1855 - West Indian sloths and two-toed tree sloths