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 †Asiadelphia Trofimov & Szalay, 1993 [monotypic]
             Family †Asiatheriidae Trofimov & Szalay, 1994
               ?Genus †Marsasia Nessov, 1997 [monotypic] see Genus Sulestes Nessov, 1985
                 1 †Marsasia aenigma Nessov, 1997 see Sulestes karakshi Nessov, 1985