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 Myliobatiformes Compagno, 1973 - stingrays Family Hexatrygonidae Heemstra & Smith, 1980 - sixgill stingrays