Phylum Chordata Bateson, 1885 - chordates
Count: -
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
  Count: -
     Class Mammalia Linnaeus, 1758 - mammals
    Count: -
       Order Perissodactyla Owen, 1848 - odd-toed ungulates
      Count: [*] 3f; †11f
         Family †Amynodontidae Scott & Osborn, 1883
        Count: -
         Family †Brontotheriidae Marsh, 1873
        Count: -
         Family †Chalicotheriidae Gill, 1872
        Count: -
         Family †Deperetellidae Radinsky, 1965
        Count: -
         Family †Eomoropidae Matthew, 1929
        Count: -
         Family Equidae Gray, 1821 - horses, zebras, and asses
        Count: -
         Family †Helaletidae Osborn, 1892
        Count: -
         Family †Hyracodontidae Cope, 1879
        Count: -
         Family †Isectolophidae Peterson, 1919
        Count: -
         Family †Lophialetidae Matthew & Granger, 1925
        Count: -
         Family †Lophiodontidae Gill, 1872
        Count: -
         Family †Palaeotheriidae Bonaparte, 1850
        Count: -
         Family Rhinocerotidae Gray, 1821 - rhinoceroses
        Count: -
         Family Tapiridae Gray, 1821 - tapirs
        Count: -