Chordata Bateson, 1885 - chordates
   Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838
     Subclass Selachii see Subdivision Selachii
       Order Euselachii Hay, 1902 see Infraclass Euselachii Hay, 1902
         Suborder Galei see Superorder Galeomorphi (Compagno, 1973)
           Series Galeoidei see Order Carcharhiniformes Compagno, 1973
             Family Sphyrnidae Gill, 1872 - hammerhead sharks