After McKenna & Bell, 1997

    Metatheria Huxley, 1880

        †Holoclemensiidae Aplin & Archer, 1987
            †Protodelphia Archer, 1984

        †Deltatheroida Kielan-Jaworowska, 1982
            †Deltatheralia Marshall & Kielan-Jaworowska 1992
            †Holarctidelphia Szalay, 1993
            †Deltatheroidiformes Kinman, 1994

            †Deltatheridiidae Gregory & Simpson, 1926
                †Deltatheridioidea Simpson, 1931
                †Deltatheridiinae Simpson, 1945
                †Deltatheridia Van Valen, 1965
              including:Sulestinae Nessov, 1985
                †Deltatheroididae Kielan-Jaworowska & Nesov, 1990

        †Asiadelphia Trofinov & Szalay, 1994

            †Asiatheriidae Trofinov & Szalay, 1994

        Marsupialia Illiger, 1811
            Pollicata Illiger, 1811
            Didelphia de Blainville, 1816
            Ferae Gray, 1821
                non Ferae Linnaeus, 1758, carnivores and related placental mammals
            Marsupiata Richardson, 1837
            Didelpha Bonaparte, 1838
            Metatheria Huxley, 1880
            Metadelphia Archer, 1984
            Marsupionta W.K. Gregory, 1947
          including:
            Salientia Illiger, 1811
                non Salientia Laurenti, 1768, the frogsArchimetatheria Szalay, 1993

                †Stagodontidae Marsh, 1889
                    †Thlaeodontidae Cope, 1892
                    †Thlaeodontinae Hay, 1930
                    †Didelphodontinae Simpson, 1927
                    †Stagodontia Archer, 1984
                    †Stagodontoidea Marshall & Kielan-Jaworowska, 1992
                    †Stagodontiformes Kinman, 1994
                    †Stagodontinae Kalandadze & Rautian, 1992
                    †Stagodontidae Marsh; McKenna & Bell, 1997
                    †Stegodontidae (lapsus calami)

                †Pediomyidae Simpson, 1927
                    †Pediomyinae Simpson, 1927
                    †Pediomyidae Clemens, 1966
                    †Pediomyidia Archer, 1984
                  including:Monodelphopsinae Szaley, 1994

            Australidelphia Szalay, 1982, in Archer, ed., 1982
              ?including:
                Gondwanadelphia Szalay, 1993
                ?NotometatheriaYingabalanaridae Archer, Every, Godthelp & Scally, 1996

                Microbiotheria Ameghino, 1889
                    Dromiciopsia Szalay, 1982, in Archer, ed., 1982
                    Microbiotheriiformes Kinman, 1994

                    Microbiotheriidae Ameghino, 1887
                        Microbiotheriidae Ameghino, 1887
                        Microbiotheriinae Simpson, 1929
                        Microbiotheroidea Reig, Kirsch & Marshall, 1985
                      including:Clenialitidae Ameghino, 1909
                        †Mirandatheriinae Szalay, 1994

                Eometatheria Simpson, 1970
                    Eomarsupialia Archer, 1984

                    †Yalkaparidontia Archer, Hand & Godthelp, 1988

                        †Yalkaparidontidae Archer, Hand & Godthelp, 1988

                    Notorycteromorphia Kirsch, in Hunsaker, 1977
                        Notoryteromorphia Kirsch, in Hunsaker, 1977
                        Syndactyliformes Szalay, in Archer (ed.), 1982
                        Notoryctiformes Kinman, 1994
                        Notoryteromorphia Kirsch; McKenna & Bell, 1997

                        Notoryctidae Ogilby, 1892
                            Notoryctoidea Kirsch, in Hunsaker, 1977

                    Dasyuromorphia Gill, 1872

                    Syndactyli Gill, 1871

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