Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
   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
         Superorder Squalomorphii (Compagno, 1973) see Division Squalea (Shirai, 1996)
           1 Order Hexanchiformes Compagno, 1973 - six-gill sharks
           2 Order Squaliformes Compagno, 1973 - dogfish sharks
           3 Order Pristiophoriformes Compagno, 1973 - saw sharks