Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758
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] †Polydolopimorphia Archer, 1984
      Count: [†*] †4f;20g
         1 [Suborder] †Polydolopiformes Goin & Candela, 1996
        Count: [†*] †2f;6g [29 Mar 2022]
         2 [Suborder] †Bonapartheriformes Carneiro, Oliveira & Goin, 2018, orth. inval. see Suborder Bonapartheriiformes Goin & Candela, 2004
        Count: [†*] †2f;14g