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 Subfamily Choloepinae Gray, 1871 see Tribe Choloepodini Gray, 1871