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Classification of Dogfish sharks Kingdom Animalia animals Phylum Chordata SubPhylum Vertebrata vertebrates Class Chondrichthyes cartilaginous fish Subclass - Elasmobranchii sharks and rays Order - Squaliformes dogfish sharks Family Squalidae Genus Squalus Species acanthias Introduction Sharks are fish that have been around longer then dinosaurs have existed They live in waters all over the world in every ocean and even in some rivers and lakes Sharks unlike other fish have no bones their skeleton is made of cartilage which is a tough fibrous substance not nearly as hard as bone There are many different species of sharks that range in size from the size of a persons hand to bigger than a bus Fully-grown sharks range in size from 7 inches long to up to 50 feet long The average size of sharks is between 5 and 7 feet long and they have a variety of body shapes Most sharks have streamlined torpedo-shaped bodies that glide easily through the water Some bottom-dwelling sharks have flattened bodies that allow them to hide in the sand of the ocean floor Some sharks have an elongated body shape snouts and tail fins which they use to catch prey There are about 368 different species of sharks which are divided into 30 families These different families of sharks are very different in the way they look live and eat They have different shapes sizes color fins teeth habitat diet personality method of reproduction and other attributes Some types of shark are very rare and some are very common like the dogfish shark Sharks may have up to 3000 teeth at one time Most sharks do not chew their food they gulp it in large pieces The teeth are arranged in rows when one tooth is damaged or lost it is replaced by another
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