Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes
   Cohort Euselachii Hay, 1902 - spined sharks and relatives see Infraclass Euselachii Hay, 1902
     Subcohort Neoselachii Compagno, 1977 - modern sharks and rays see Cohort Neoselachii Compagno, 1977
       Order Carcharhiniformes Compagno, 1973 - ground sharks
         1 Family Scyliorhinidae Gill, 1862 - cat sharks
         2 Family Proscylliidae Fowler, 1941 - finback catsharks
         3 Family Triakidae Gray, 1851 - houndsharks
         4 Family Hemigaleidae Hasse, 1879 - weasel sharks
         5 Family Carcharhinidae Jordan & Evermann, 1896 - requiem sharks
         6 Family Sphyrnidae Gill, 1872 - hammerhead sharks