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 †Dicynodontia Owen, 1859 see [unranked] Dicynodontia Owen, 1859
                   Infraorder †Diictodontia
                     1 Family †Emydopidae (Cluver & King, 1983)
                     2 Family †Cistecephalidae (Broom, 1903)
                     3 Family †Robertiidae Cluver & King, 1983
                     4 Family †Diictodontidae Kemp, 1982