Class Mammalia Linnaeus, 1758 - mammals Subclass †Allotheria Marsh, 1880 Order †Multituberculata Cope, 1884 Family †Arginbaataridae Hahn & Hahn, 1983, incertae sedis [monotypic] Genus †Arginbaatar Trofimov, 1980 [monotypic] 1 †Arginbaatar dmitrievae Trofimov, 1980