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 Reptilia Linnaeus, 1758 - reptiles
               Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903
                 Order †Therapsida Broom, 1905 see [unranked] Therapsida Broom, 1905
                   Suborder †Theriodontia Owen, 1876
                     01 Family †Phtinosuchidae
                     02 Family †Brithopodidae Efremov, 1954
                     03 Family †Gorgonopsidae Lydekker, 1890
                     04 Family †Rubidgeidae Broom, 1938
                     05 Family †Ictidorhinidae Boonstra, 1952
                     06 Family †Burnetiidae Broom, 1923
                     07 Family †Procynosuchidae Broom, 1937
                     08 Family †Thrinaxodontidae Watson & Romer, 1956
                     09 Family †Cynognathidae Seeley, 1895
                     10 Family †Diademodontidae Haughton, 1925
                     11 Family †Traversodontidae Huene, 1936
                     12 Family †Tritylodontidae Cope
                     13 Family †Pristerognathidae Broom, 1908
                     14 Family †Trochosuchidae Watson & Romer, 1956
                     15 Family †Waitsiidae Haughton, 1918 see Family Whaitsiidae Haughton, 1918
                     16 Family †Euchambersiidae Boonstra, 1934
                     17 Family †Ictidosuchidae Broom, 1903
                     18 Family †Bauriidae Broom, 1911
                     19 Family †Scaloposauridae Broom, 1914
                     20 Family †Ericiolacertidae Watson & Romer, 1956
                     21 Family †Diarthrognathidae Crompton