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
       1 Genus Choloepus Illiger, 1811 - two-toed tree sloths