Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Chondrichthyes Huxley, 1880 - cartilaginous fishes Order Carcharhiniformes Compagno, 1973 - ground sharks Family Sphyrnidae Gill, 1872 - hammerhead sharks Genus Sphyrna Rafinesque, 1810 Sphyrna tudes (Valenciennes, 1822) - great hammerhead