What is the largest species of shark?

Fish vary greatly in size. The extant whale shark and basking shark exceed all other fish by a considerable margin in weight and length. The extinct Otodus megalodon exceeds all other fish, extant and extinct, in size. Fish in the common usage are a paraphyletic group that describes aquatic vertebrates while excluding the tetrapods, four limbed vertebrates nested within the lobe-finned fish, which include all land vertebrates and their nearest extinct relatives.