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 †Deltatheroida Kielan-Jaworowska, 1982 see Order Deltatheroida Kielan-Jaworowska, 1982
         Family †Deltatheridiidae Gregory & Simpson, 1926
           1 Genus †Deltatheridiumᵀ Gregory & Simpson, 1926
           2 Genus †Deltatheroides Gregory & Simpson, 1926 [monotypic]
           3 Genus †Deltatherus Nessov, 1997 [monotypic] see Genus Sulestes Nessov, 1985
           4 Genus †Sulestes Nessov, 1985 [monotypic]