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]
               Genus †Alphadonᵀ Simpson, 1927
                 01 †Alphadon marshiᵀ Simpson, 1927
                 02 †Alphadon attaragos Lillegraven & McKenna, 1986
                 03 †Alphadon clemensi Eaton, 1993
                 04 †Alphadon eatoni Cifelli & de Muizon, 1998
                 05 †Alphadon halleyi Sahni, 1972
                 06 †Alphadon jasoni Storer, 1991
                 07 †Alphadon lillegraveni Eaton, 1993
                 08 †Alphadon perexiguus Cifelli, 1994
                 09 †Alphadon sahnii Lillegraven & McKenna, 1986
                 10 †Alphadon wilsoni Lillegraven, 1969