Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Mammalia Linnaeus, 1758 - mammals
               Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
                 Superorder Protungulata
                   Order †Tillodontia Marsh, 1875
                     Family †Esthonychidae Cope, 1883 see Family Tillotheriidae Marsh, 1875
                       1 Genus †Trogosus Leidy, 1871
                       2 Genus †Tillodon Gazin, 1953
                       3 Genus †Esthonyx Cope, 1874
                       4 Genus †Adapidium Young, 1937