Class Mammalia Linnaeus, 1758 - mammals Subclass †Allotheria Marsh, 1880 Order †Multituberculata Cope, 1884 Suborder †Cimolodonta McKenna, 1975 Family †Cimolomyidae Marsh, 1889, incertae sedis Genus †Cimolomysᵀ Marsh, 1889 †Cimolomys major Russell, 1937