Class Mammalia Linnaeus, 1758 - mammals
   Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     Infraclass Metatheria Huxley, 1880
       Cohort Marsupialia Jameson, 1818 - marsupials
         Superorder "Ameridelphia" Szalay, 1982 [paraphyletic] see Clade Ameridelphia Szalay 1982
           Order "Didelphimorphia" Gill, 1872 [paraphyletic]
             Family †Alphadontidae Marshall, Case & Woodburne, 1990 [paraphyletic]
               1 Genus †Alphadonᵀ Simpson, 1927
               2 Genus †Aenigmadelphys Cifelli & Johanson, 1994 [monotypic]
               3 Genus †Albertatherium Fox, 1971
               4 Genus †Protalphadon Cifelli, 1990
               5 Genus †Turgidodon Cifelli, 1990
               6 Genus †Varalphadon Johanson, 1996