[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977 Order Carcharhiniformes Compagno, 1973 - ground sharks Family Sphyrnidae Gill, 1872 - hammerhead sharks Genus Eusphyra Gill, 1862 [monotypic] Eusphyra blochii (Cuvier, 1817) - arrowhead