After Szalay & Trofimov, 1996

<==o Metatheria
   |-- †Deltatheroida Kielan-Jaworowska, 1982
   `--+--o †Asiadelphia Trofinov & Szalay, 1994
      |  |?- †Kokopellia juddi Cifelli, 1993
      |  `--+-- †Marsasia Nesov, 1997 
      |     `-- †Asiatherium reshetovi Trofinov & Szalay, 1994 [Asiatheriidae Trofinov & Szalay, 1994]
      `==+==o †Archimetatheria Szalay, 1993 [paraphyletic] [taxonomic history]
         |  |-- †Stagodontidae Marsh, 1889
         |  `-- †Pediomyidae Simpson, 1927
         |--+-- †Sudameridelphia
         |  `--+-- †Simpsonitheria Szalay, in Szalay, Novacek & McKenna, eds., 1993
         |     `-- Paucituberculata Ameghino, 1894
         `--+-- Didelphimorphia Gray, 1821 (opossum-like marsupials)
            `--+--+-- Microbiotheria Ameghino, 1889
               |  `-- Dasyuromorphia Gill, 1872
               `--o Syndactyli Gill, 1871 [Syndactyla Wood Jones, 1924] (yhdysvarpaiset)
                  |--+?- Peramelia Ameghino, 1889
                  |  `?- Notorycteromorpha Kirsch, in Hunsaker, 1977
                  `--+?-o †Yalkaparidontia
                     |  `-- †Yalkaperidon Archer, Hand & Godthelp, 1988 
                     `-- Diprotodontia Owen, 1866 (harvaetuhampaiset)

Reference(s):