Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     01 Family Aplodontidae Trouessart, 1897, orth. inval. - sewellel see Family Aplodontiidae Brandt, 1855
     02 Family Sciuridae Batsch, 1788 - squirrels, chipmunks, marmots, and prairie dogs
     03 Family Geomyidae Bonaparte, 1845 - pocket gophers
     04 Family Heteromyidae Gray, 1868 - pocket mice, kangaroo rats, and kangaroo mice
     05 Family Castoridae Batsch, 1788 - beavers
     06 Family Anomaluridae Gervais, 1849 - scaly-tailed squirrels
     07 Family Pedetidae Gray, 1825 - springhare
     08 Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
     09 Family Gliridae Muirhead, 1819 - dormice
     10 Family Seleviniidae Bashanov & Belosludov, 1939 - desert dormouse see Subtribe Seleviniina Bashanov & Belosludov, 1939
     11 Family Zapodidae Coues, 1875 - jumping mice
     12 Family Dipodidae Fischer de Waldheim, 1817 - jerboas
     13 Family Hystricidae Fischer de Waldheim, 1817 - Old World porcupines
     14 Family Erethizontidae Bonaparte, 1845 - New World porcupines
     15 Family Caviidae Fischer de Waldheim, 1817 - cavies and Patagonian "hares"
     16 Family Hydrochaeridae (Gray, 1825) Cabrera, 1961 - capybara see Family Hydrochoeridae Gray, 1825
     17 Family Dinomyidae Peters, 1873 - pacarana
     18 Family Dasyproctidae Gray, 1825 - agoutis and pacas
     19 Family Chinchillidae Bennett, 1833 - viscachas and chinchillas
     20 Family Capromyidae Smith, 1842 - hutias and nutria
     21 Family Myocastoridae Ameghino, 1902
     22 Family Octodontidae Waterhouse, 1840 - octodonts
     23 Family Ctenomyidae Lesson, 1842 - tuco-tucos
     24 Family Abrocomidae Miller & Gidley, 1918 - chinchilla-rats
     25 Family Echimyidae Gray, 1825 - spiny rats
     26 Family Thryonomyidae Pocock, 1922 - cane rats
     27 Family Petromuridae Tullberg, 1899 - dassie rat
     28 Family Bathyergidae Waterhouse, 1841 - African mole-rats
     29 Family Ctenodactylidae Gervais, 1853 - gundis