living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Mammalia Linnaeus, 1758 - mammals
               Subclass Theria Parker & Haswell, 1897
                 Infraclass Eutheria Gill, 1872
                   Order Rodentia Bowdich, 1821 - rodents
                     Suborder Hystricomorpha Brandt, 1855
                       Superfamily Hystricoidea Fischer de Waldheim, 1817
                         Family Hystricidae Fischer de Waldheim, 1817 - Old World porcupines
                           1 Genus Hystrix Linnaeus, 1758 - short-tailed porcupines
                           2 Genus Thecurus Lyon, 1907 see Genus Hystrix Linnaeus, 1758
                           3 Genus Atherurus Cuvier, 1829 - brush-tailed porcupines
                           4 Genus Trichys Günther, 1877 - long-tailed porcupine