Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
       Family ‡Heptaxodontidae Anthony, 1917
         Subfamily ‡Heptaxodontinae Anthony, 1917 see Family Heptaxodontidae Anthony, 1917
           1 Genus ‡Amblyrhiza Cope, 1868
           2 Genus ‡Elasmodontomys Anthony, 1916
           3 Genus ‡Quemisia Miller, 1929