Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Multituberculata Cope, 1884
       Suborder †Cimolodonta McKenna, 1975
         Family †Cimolomyidae Marsh, 1889, incertae sedis
           ?Genus †Essonodon Simpson, 1927 [monotypic]
             †Essonodon browni Simpson, 1927