Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Mammalia Linnaeus, 1758 - mammals
             Subclass †Allotheria Marsh, 1880 [monotypic]
               Order †Multituberculata Cope, 1884
                 Suborder †Ptilodontoidea Sloan & Van Valen, 1965 see Superfamily Ptilodontoidea Gregory & Simpson, 1926 (1887)
                   1 Family †Boffiidae Hahn & Hahn, 1983
                   2 Family †Neoplagiaulacidae Ameghino, 1890
                   3 Family †Cimolodontidae Marsh, 1889
                   4 Family †Ptilodontidae Gregory & Simpson, 1926 (1887)