Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Superclass Pisces Linnaeus, 1758 - fishes Chondrichthyes Huxley, 1880 - cartilaginous fishes Family Sphyrnidae Gill, 1872 - hammerhead sharks 1 Genus Sphyrna Rafinesque, 1810