Mammaliaformes Rowe 1988
   [crown] Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theriiformes Rowe, 1988 see Division Theriiformes Rowe, 1988
       Infraclass †Triconodonta Osborn, 1888 see Order Triconodonta Osborn, 1888
         Family †Triconodontidae Marsh, 1887
           Subfamily †Triconodontinae Marsh, 1887
             1 Genus †Trioracodon Simpson, 1928
             2 Genus †Triconodon Owen, 1859
             3 Genus †Priacodon Marsh, 1887
             4 Genus †Astroconodon Patterson, 1951