Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758
   Metatheria Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Metatheria Huxley, 1880
     Marsupialiformes Vullo, Gheerbrant, de Muizon & Néraudeau, 2009
       [Order] †Sparassodonta Ameghino, 1894
         Superfamily ‡Borhyaenoidea Ameghino, 1894
           1 Genus †Lycopsis Cabrera, 1927
           2.1.1 Genus †Prothylacynus Ameghino, 1891
           2.1.2 Genus †Pharsophorus Ameghino, 1897
           2.2.1 Family †Proborhyaenidae Ameghino, 1897
           2.2.2.1 Family †Borhyaenidae Ameghino, 1894
           2.2.2.2.1 Genus †Paraborhyaena Hoffstetter & Petter, 1983
           2.2.2.2.2 Family †Thylacosmilidae Riggs, 1933