Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Mammalia Linnaeus, 1758 - mammals
       Order Edentata Vicq-d'Azyr, 1792 see Order Xenarthra Cope, 1889
         Family Bradypodidae Batsch, 1788 - three-toed tree sloths
         Family Choloepidae (Gray, 1871)
         Family Dasypodidae Gray, 1821 - armadillos
         Family †Entelopidae Ameghino, 1889
         Family †Glyptodontidae Gray, 1869
         Family Megalonychidae Gervais, 1855 - West Indian sloths and two-toed tree sloths
         Family †Megatheriidae Gray, 1821
         Family †Mylodontidae Gill, 1872
         Family Myrmecophagidae Gray, 1825 - anteaters
         Family †Palaeopeltidae Ameghino, 1895
         Family †Sudamericidae Scillato-Yané & Pascual, 1984