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
         Genus †Oxlestes Nessov, 1982, incertae sedis [monotypic]
           1 †Oxlestes grandis Nessov, 1982