This chapter discusses the long evolutionary history of the cartilaginous fishes. Topics covered include the sharks and chimaeras of the Paleozoic era (species diversification, Early Paleozoic sharks, Late Paleozoic sharks, Paleozoic chimaeras); the Paleozoic ecosystem (Permian extinctions, sharks and rays of the Mesozoic Era); the demise of the giant-tooth shark; and orders of extant the cartilaginous fishes.
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