Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Pilosa Flower, 1883 - sloths
       Suborder Folivora Delsuc, Catzeflis, Stanhope & Douzery, 2001
         Family Megalonychidae Gervais, 1855 - West Indian sloths and two-toed tree sloths
           Genus Choloepus Illiger, 1811 - two-toed tree sloths
             1 Choloepus didactylus (C. Linnaeus, 1758) - southern two-toed sloth
             2 Choloepus hoffmanni Peters, 1858 - Hoffmann's two-toed sloth