Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Multituberculata Cope, 1884
       Suborder †"Plagiaulacida" Ameghino, 1889 [paraphyletic]
         †Paulchoffatiid line
           Family †Hahnodontidae Sigogneau-Russell, 1991 [monotypic]
             1 Genus †Hahnodon Sigogneau-Russell, 1991 [monotypic]