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]
             Mammaliamorpha Rowe 1988
               Mammaliaformes Rowe 1988
                 Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758
                   1 Monotremata Bonaparte 1837 [Rowe 1988] see Order Monotremata Bonaparte, 1837
                   2 †Dryolestida Prothero 1981 see Order Dryolestida Prothero, 1981
                   3 Genus †Ambolotherium
                   4 Genus †Amphitherium Blainville, 1838
                   5 Genus †Amphilestes Owen, 1859
                   6.1 Genus †Phascolotherium Owen, 1838
                   6.2 Genus †Triconodon Owen, 1859
                   6.3 Genus †Peramus Owen, 1871
                   6.4 Genus †Trioracodon Simpson, 1928
                   6.5 Genus †Spalacotherium Owen, 1854
                   6.6 Theriiformes Rowe 1988