Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
       Family Octodontidae Waterhouse, 1840 - octodonts
         Genus Octomys Thomas, 1920 - viscacha rats
           1 Octomys mimax Thomas, 1920 - viscacha-rat