Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
   Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theria Parker & Haswell, 1897
       Infraclass Eutheria Gill, 1872
         Cohort Epitheria McKenna, 1975
           Superorder Glires Linnaeus, 1758 see Grandorder Glires Linnaeus, 1758
             Order Rodentia Bowdich, 1821 - rodents
               Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
                 Family †Paramyidae Miller & Gidley, 1918 see Subfamily Paramyinae Haeckel, 1895
                   Genus †Ischyromys Leidy, 1856