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
                 1 Suborder †Eotitanosuchia (Boonstra, 1963)
                 2 Suborder †Dinocephalia Seeley, 1894 see [unranked] Dinocephalia Seeley, 1894
                 3 Suborder †Dicynodontia Owen, 1859 see [unranked] Dicynodontia Owen, 1859
                 4 Suborder †Gorgonopsia Seeley, 1894 see [unranked] Gorgonopsia Seeley, 1894
                 5 Suborder †Therocephalia Broom, 1903 see [unranked] Therocephalia Broom, 1903
                 6 Suborder †Cynodontia Owen, 1861 - cynodonts see Clade Cynodontia Owen 1861 [Gauthier, Kluge & Rowe 1988]