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
             †Pucadelphyda de Muizon, Ladevèze, Selva, Vignaud & Goussard, 2018
            Count: [†*] †2o;1f;7g
               †Polydolopimorphia Archer, 1984
              Count: [†*] †2g
                 Genus †Gashternia Simpson, 1935
                Count: -