Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Mammalia Linnaeus, 1758 - mammals
             Subclass Theria Parker & Haswell, 1897
               Theria of Metatherian-Eutherian grade
                 Infraclass Eutheria Gill, 1872
                   Order Perissodactyla Owen, 1848 - odd-toed ungulates
                     Suborder Ceratomorpha Wood, 1937
                       Superfamily Tapiroidea Gray, 1825
                         1 Family †Isectolophidae Peterson, 1919
                         2 Family †Helaletidae Osborn, 1892
                         3 Family †Lophialetidae Matthew & Granger, 1925
                         4 Family †Deperetellidae Radinsky, 1965
                         5 Family †Lophiodontidae Gill, 1872
                         6 Family Tapiridae Gray, 1821 - tapirs