Cartilaginous Fish - Rays, Sharks, Chondrichthyes, Myliobatiformes, List of Megamouth Shark Specimens and Sightings, List of Sharks (Paperback)

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 46. Chapters: Rays, Sharks, Chondrichthyes, Myliobatiformes, List of megamouth shark specimens and sightings, List of sharks, Shark attack, Chimaera, Grey nurse shark conservation, The Physical Impossibility of Death in the Mind of Someone Living, Egg case, Electric ray, Ampullae of Lorenzini, Physical characteristics of sharks, Elasmobranchii, Shark cartilage, Watson and the Shark, Shark Week, Shark net, Stronsay Beast, Hakarl, 1992 Cageless shark-diving expedition, Shark threat display, White Shark Cafe, Shark tourism, List of Red Sea sharks, Leonard Compagno, Rajiformes, Shark liver oil, Protective Oceanic Device, Shark proof cage, Oophagy, Close to Shore, Shark Trust, Red Triangle, Sclerorhynchus, Twelve Days of Terror, Spiral valve, Holocephali, Shark suit, International Shark Attack File, Bradyodonti, Freshwater shark, Aellopos. Excerpt: Sharks (superorder Selachimorpha) are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago. Since that time, sharks have diversified into 440 species, ranging in size from the small dwarf lanternshark, Etmopterus perryi, a deep sea species of only 17 centimetres (6.7 in) in length, to the whale shark, Rhincodon typus, the largest fish, which reaches approximately 12 metres (39 ft) and which feeds only on plankton, squid, and small fish by filter feeding. Sharks are found in all seas and are common down to depths of 2,000 metres (6,600 ft). They generally do not live in freshwater, with a few exceptions such as the bull shark and the river shark which can live both in seawater and freshwater. They breathe through five to seven gill slits. Sharks have a covering of dermal denticles that protects their skin from damage and parasites, and improves their fluid dynamics so the shark can move faster. Th...