Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
     Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
       Order Carcharhiniformes Compagno, 1973 - ground sharks
         Family Sphyrnidae Bonaparte, 1840 - hammerhead sharks
           Genus Sphyrna Rafinesque, 1810
             Sphyrna lewini (Griffith & Smith, 1834) - scalloped hammerhead
             Sphyrna mokarran (Rüppell, 1837) - great hammerhead
             Sphyrna tudes (Valenciennes, 1822) - great hammerhead
             Sphyrna zygaena (C. Linnaeus, 1758) - common hammerhead