Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theria Parker & Haswell, 1897
       Infraclass Eutheria Gill, 1872
         Cohort Edentata Cuvier, 1798
           Order Xenarthra Cope, 1889 - xenarthrans see Magnorder Xenarthra Cope, 1889
             Family Megalonychidae Gervais, 1855 - West Indian sloths and two-toed tree sloths
               1 Genus †Hapalops Ameghino, 1887