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] †Peradectia Marshall, Case & Woodburne, 1990
      Count: [†*] †4f;18g [29 Mar 2022]
         1 Superfamily †Peradectoidea Marshall et al., 1990 see Order Peradectia Marshall, Case & Woodburne, 1990
        Count: [†*] †3f;10g [29 Mar 2022]
         2.1 Genus †Szalinia de Muizon & Cifelli, 2001
        Count: -
         2.2.1.1 Genus †Tiulordia Marshall & de Muizon, 1988
        Count: -
         2.2.1.2 Genus †Gaylordia Paula Couto, 1952
        Count: -
         2.2.2.1.1 Genus †Marmosopsis Paula Couto, 1962
        Count: -
         2.2.2.1.2 Genus †Incadelphys Marshall & de Muizon, 1988
        Count: -
         2.2.2.2 Family †Jaskhadelphyidae de Muizon, 1992
        Count: [†*] †3g [29 Mar 2022]