Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Multituberculata Cope, 1884
       1 Suborder †"Plagiaulacida" Ameghino, 1889 [paraphyletic]
       2 Family †Arginbaataridae Hahn & Hahn, 1983, incertae sedis [monotypic]
       3 Suborder †Cimolodonta McKenna, 1975