Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
   Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
     Synapsida Osborn 1903 [Gauthier et al. 1989]
       Therapsida Broom, 1905
         †Eutheriodontia
           Cynodontia Owen 1861 [Gauthier, Kluge & Rowe 1988]
             1 Genus †Procynosuchus Broom, 1937
             2.1 Genus †Thrinaxodon Seeley, 1894
             2.2.1 Genus †Diademodon Seeley, 1895
             2.2.2.1 Genus †Exaeretodon Cabrera, 1943
             2.2.2.2 Genus †Scalenodontoides Crompton & Ellenberger, 1957
             2.2.2.3 Genus †Scalenodon Crompton, 1955
             2.2.2.4 Genus †Luangwa Brink, 1963
             2.2.2.5 Mammaliamorpha Rowe 1988