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