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
                   Theriiformes Rowe 1988
                     Theria Parker & Haswell 1897 [McKenna 1975] see Subclass Theria Parker & Haswell, 1897
                       1 Marsupialia Jameson 1818 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Cohort Marsupialia Jameson, 1818
                       2 Placentalia Owen 1837 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Cohort Placentalia Owen, 1837