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 †Condylarthra Cope, 1881
                     Superfamily †Phenacodontoidea Cope, 1881 see Family Phenacodontidae Cope, 1881
                       Family †Phenacodontidae Cope, 1881
                         Genus †Ectocion Cope, 1882
                         Genus †Phenacodus Cope, 1873
                         Genus †Tetraclaenodon Scott, 1892