Class [Mammalia] Linnaeus, 1758 - mammals
   Order Xenarthra Cope, 1889 - xenarthrans see Magnorder Xenarthra Cope, 1889
     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