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
       Notometatheria Kirsch, Lapointe & Springer 1997
      Count: [*†*] 6o;1f;14g; †6f;36g
         Marsupialia Jameson 1818 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Cohort Marsupialia Jameson, 1818
        Count: [*†*] 6o;1f;14g; †3f;24g
           [Order] Didelphimorphia Gill, 1872
          Count: [*†*] 1f;3g; †3f;13g
             Family †Protodidelphidae Marshall, 1987
            Count: [†*] †5g [31 Mar 2022]
               Genus †Guggenheimia Paula Couto, 1952
              Count: -