Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Hystricognathi Tullberg, 1899 see Infraorder Hystricognathi Tullberg, 1899
       Family Erethizontidae Bonaparte, 1845 - New World porcupines
         1 Genus Coendou Lacépède, 1799 - prehensile-tailed porcupines
         2 Genus Echinoprocta Gray, 1865 - Upper Amazonian porcupine see Genus Coendou Lacépède, 1799
         3 Genus Erethizon Cuvier, 1822 - North American porcupine
         4 Genus Sphiggurus Cuvier, 1825 see Subgenus Sphiggurus F. Cuvier, 1825