Clade Mammaliaformes Rowe 1988 [Rowe 1988]
   [crown] Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theriiformes (Rowe, 1988) M.C. McKenna & S.K. Bell, 1997 see Division Theriiformes
       Infraclass †Allotheria Marsh, 1880 see [unranked] Allotheria
         Order †Multituberculata Cope, 1884
           Suborder †Cimolodonta (McKenna, 1975) Kielan-Jaworowska & Nessov, 1992
             Superfamily †Ptilodontoidea (Cope, 1887) M.C. McKenna & S.K. Bell, 1997
               1 Family †Cimolodontidae Marsh, 1889
               2 Family †Ptilodontidae Cope, 1887