Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Class Mammalia Linnaeus, 1758 - mammals
       Subclass Theria Parker & Haswell, 1897
         Infraclass Placentalia Owen, 1837 see Cohort Placentalia Owen, 1837
           Order Rodentia Bowdich, 1821 - rodents
             Suborder Hystricomorpha Brandt, 1855
               Infraorder Hystricognathi Tullberg, 1899
                 01 Family Bathyergidae Waterhouse, 1841 - African mole-rats
                 02 Family Hystricidae Fischer de Waldheim, 1817 - Old World porcupines
                 03 Family Petromuridae Tullberg, 1899 - dassie rat
                 04 Family Thryonomyidae Pocock, 1922 - cane rats
                 05 Family Erethizontidae Bonaparte, 1845 - New World porcupines
                 06 Family Chinchillidae Bennett, 1833 - viscachas and chinchillas
                 07 Family Dinomyidae Peters, 1873 - pacarana
                 08 Family Caviidae Fischer de Waldheim, 1817 - cavies and Patagonian "hares"
                 09 Family Dasyproctidae Gray, 1825 - agoutis and pacas
                 10 Family Cuniculidae Miller & Gidley, 1918
                 11 Family Ctenomyidae Lesson, 1842 - tuco-tucos
                 12 Family Octodontidae Waterhouse, 1840 - octodonts
                 13 Family Abrocomidae Miller & Gidley, 1918 - chinchilla-rats
                 14 Family Echimyidae Gray, 1825 - spiny rats
                 15 Family Myocastoridae Ameghino, 1902
                 16 Family Capromyidae Smith, 1842 - hutias and nutria
                 17 Family Heptaxodontidae Anthony, 1917