Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes see Infraclass Elasmobranchii Bonaparte, 1838 Count: - Cohort Euselachii Hay, 1902 - spined sharks and relatives see Subclass Euselachii Hay, 1902 Count: - Subcohort Neoselachii Compagno, 1977 - modern sharks and rays see Infraclass Elasmobranchii Bonaparte, 1838 Count: - Order Lamniformes Berg, 1958 - mackerel sharks Count: - Family Alopiidae Bonaparte, 1835 - thresher sharks Count: -