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• Domain: Eukaryota () - Whittaker & Margulis,1978
  • Kingdom: Animalia () - Linnaeus, 1758 - animals
    • Subkingdom: Bilateria () - (Hatschek, 1888) Cavalier-Smith, 1983
      • Branch: Deuterostomia () - Grobben, 1908
        • Infrakingdom: Chordonia () - (Haeckel, 1874) Cavalier-Smith, 1998
          • Phylum: Chordata () - Bateson, 1885 - Chordates
            • Subphylum: Vertebrata () - Cuvier, 1812 - Vertebrates
              • Infraphylum: Gnathostomata () - Auct. - Jawed Vertebrates
                • Class: Chondrichthyes ()
                  • Order: Ctenacanthiformes ()
                    • Family: Ctenacanthidae ()
                      • Genus: Ctenacanthus ()
                        • Specific name: ishii
                          • Scientific name: - Ctenacanthus ishii