Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Multituberculata Cope, 1884
       Suborder †"Plagiaulacida" Ameghino, 1889 [paraphyletic]
         †Allodontid line
           Family †Allodontidae Marsh, 1889
             Genus †Ctenacodonᵀ Marsh, 1879
               †Ctenacodon serratusᵀ Marsh, 1879