Mammalia Linnaeus 1758 [Rowe 2020] see Class Mammalia Linnaeus, 1758
Count: [*†*] 4o;1f;14g; †3o;5f;41g;1s
   Theria Parker & Haswell 1897 [McKenna 1975] see Subclass Theria Parker & Haswell, 1897
  Count: [*†*] 4o;1f;14g; †3o;5f;40g;1s
     Metatheria Huxley 1880 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Metatheria Huxley, 1880
    Count: [*†*] 4o;1f;14g; †3o;5f;37g;1s
       Marsupialiformes Vullo, Gheerbrant, de Muizon & Néraudeau, 2009
      Count: [*†*] 4o;1f;14g; †3o;5f;34g;1s
         †Ameridelphia Szalay 1982
        Count: [*†*] 4o;1f;14g; †3o;5f;33g;1s
           Sudameridelphia Szalay 1994
          Count: [*†*] 4o;1f;14g; †2o;5f;28g;1s
             Notometatheria Kirsch, Lapointe & Springer 1997
            Count: [*†*] 4o;1f;14g; †3f;18g;1s
               [Family] †Derorhynchidae Marshall, 1987
              Count: [†*] †4g;1s
                 Genus †Pauladelphys Goin, Case, Woodburne, Vizcaino & Reguero, 1999
                Count: -