Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Teleostomi
       Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
         Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988] - amniotes
           Class Mammalia Linnaeus, 1758 - mammals
             Subclass Theria Parker & Haswell, 1897
               Theria of Metatherian-Eutherian grade
                 Infraclass Eutheria Gill, 1872
                   Order Rodentia Bowdich, 1821 - rodents
                     Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
                       Infraorder Protrogomorpha (Zittel, 1893)
                         Superfamily †Ischyromyoidea Alston, 1876
                           1 Family †Paramyidae Miller & Gidley, 1918 see Subfamily Paramyinae Haeckel, 1895
                           2 Family †Sciuravidae Miller & Gidley, 1918
                           3 Family †Cylindrodontidae Miller & Gidley, 1918
                           4 Family †Protoptychidae Schlosser, 1911
                           5 Family †Ischyromyidae Alston, 1876