Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Reptilia Linnaeus, 1758 [paraphyletic] - reptiles
             Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903
               Order †Therapsida Broom, 1905 see [unranked] Therapsida Broom, 1905
                 Suborder †Cynodontia Owen, 1861 - cynodonts see Clade Cynodontia Owen 1861 [Gauthier, Kluge & Rowe 1988]
                   Infraorder †Eucynodontia Kemp, 1982
                     Superfamily †Tritylodontoidea (Simpson, 1928)
                       1 Family †Diademodontidae Haughton, 1925
                       2 Family †Trirachodontidae Romer, 1967
                       3 Family †Traversodontidae Huene, 1936
                       4 Family †Tritylodontidae Cope