Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Clade Mammalia Linnaeus 1758 [Rowe 2020]
Count: [*†*] 6o;1f;14g; †7o;26f;156g;4s
   Metatheria Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Metatheria Huxley, 1880
  Count: [*†*] 6o;1f;14g; †6o;26f;143g;4s
     Marsupialiformes Vullo, Gheerbrant, de Muizon & Néraudeau, 2009
    Count: [*†*] 6o;1f;14g; †5o;25f;134g;4s
       [Order] †Sparassodonta Ameghino, 1894
      Count: [†*] †5f;20g;1s [28 Mar 2022]
         Superfamily ‡Borhyaenoidea Ameghino, 1894
        Count: [†*] †3f;11g [28 Mar 2022]
           1 Genus †Lycopsis Cabrera, 1927
          Count: -
           2.1.1 Genus †Prothylacynus Ameghino, 1891
          Count: -
           2.1.2 Genus †Pharsophorus Ameghino, 1897
          Count: -
           2.2.1 Family †Proborhyaenidae Ameghino, 1897
          Count: [†*] †2g
           2.2.2.1 Family †Borhyaenidae Ameghino, 1894
          Count: [†*] †3g
           2.2.2.2.1 Genus †Paraborhyaena Hoffstetter & Petter, 1983
          Count: -
           2.2.2.2.2 Family †Thylacosmilidae Riggs, 1933
          Count: [†*] †2g [28 Mar 2022]