Structural And Functional Adaptations
Sharks are generally fusiform in body shape, with a narrow snout, wider body, and a tapering tail. Sharks have one or two fins on their dorsal surface (back), a pair of pectoral fins, a pair of pelvic fins, usually a single anal fin on the ventral surface (belly), and a caudal (tail) fin. Usually the upper lobe of the caudal fin is larger than the lower lobe. The pelvic fins of male sharks have a projection called a clasper, which is used in sexual reproduction.