Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Goodrich, 1930
         Amniota Haeckel, 1866 - amniotes
           Class Mammalia Linnaeus, 1758 - mammals
             Subclass Theria Parker & Haswell, 1897
               Theria of Metatherian-Eutherian grade
                 Infraclass Eutheria Gill, 1872
                   Order †Creodonta Cope, 1875 [monotypic]
                     Suborder †Hyaenodontia see Order Creodonta Cope, 1875
                       1 Family †Hyaenodontidae Leidy, 1869
                       2 Family †Oxyaenidae Cope, 1877