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
                   Genus †Phascolotherium Owen, 1838
                     1 †Phascolotherium bucklandi (Broderip, 1828)