Mammaliaformes Rowe 1988
   [crown] Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
       Infraclass Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg, 1995 see Clade Holotheria Wible, Rougier, Novacek, McKenna & Dashzeveg 1995
         Superlegion Trechnotheria McKenna, 1975 see Clade Trechnotheria McKenna 1975
           Legion Cladotheria McKenna, 1975 see Clade Cladotheria McKenna 1975
             Sublegion Zatheria McKenna, 1975 see Clade Zatheria McKenna 1975
               Infralegion Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
                 [crown] Supercohort Theria Parker & Haswell, 1897 - therians see Subclass Theria Parker & Haswell, 1897
                   Cohort Marsupialia Jameson, 1818 - marsupials
                     Magnorder Ameridelphia Szalay, 1982 see Clade Ameridelphia Szalay 1982
                       Order Didelphimorphia Gill, 1872
                         Family Didelphidae Gray, 1821 - American opossums
                           01 Genus †Bistius Clemens & Lillegraven, 1986
                           02 Genus †Turgidodon Cifelli, 1990
                           03 Genus †Varalphadon Johanson, 1996
                           04 Genus †Esteslestes Novacek, Ferrusquia-Villafranca, Flynn, Wyss & Norell, 1991
                           05 Subfamily †Alphadontinae Marshall, Case & Woodburne, 1990 see Family Alphadontidae Marshall, Case & Woodburne, 1990
                           06 Subfamily †Peradectinae Crochet, 1979 see Family Peradectidae Crochet, 1979
                           07 Subfamily †Herpetotheriinae Trouessart, 1879 see Family Herpetotheriidae Trouessart, 1879
                           08 Subfamily Didelphinae Gray, 1821
                           09 Subfamily †Eobrasiliinae Marshall, 1987 see Family Stagodontidae Marsh, 1889
                           10 Subfamily †Derorhynchinae Marshall, 1987 see Family Derorhynchidae Marshall, 1987
                           11 Subfamily Caluromyinae Kirsch & Reig, 1977