Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
       Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes
         Superorder Euselachii Hay, 1902 see Infraclass Euselachii Hay, 1902
           Order Galeomorpha see Superorder Galeomorphii Compagno, 1973
             Suborder Carcharhinoidea see Order Carcharhiniformes Compagno, 1973
               1 Family Scyliorhinidae Gill, 1862 - cat sharks
               2 Family Pseudotriakidae Gill, 1893 - false catsharks
               3 Family Triakidae Gray, 1851 - houndsharks
               4 Family Carcharhinidae Jordan & Evermann, 1896 - requiem sharks
               5 Family Sphyrnidae Gill, 1872 - hammerhead sharks