Kingdom Animalia Linnaeus, 1758 - animals Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812 Pisces Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 Order Heterodontiformes Compagno, 1973 - bullhead sharks 1 Family Heterodontidae Gray, 1851 - bullhead and horn sharks