[Neoselachii] Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977
   Order Carcharhiniformes Compagno, 1973 - ground sharks
     Family Sphyrnidae Gill, 1872 - hammerhead sharks
       1 Genus Eusphyra Gill, 1862 [monotypic]
       2 Genus Sphyrna Rafinesque, 1810