You are seeing Ask web results for cartilaginous fish.
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"The skeletons of sharks, skates, and rays are composed of cartilage rather than bone. The 800 or so species primarily inhabit the marine realm, but a few venture into freshwater. Although they have a reputation ... In fact, sharks and their allies are extremely beneficial. Unfortunately, many species are under severe threat,
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The class Chondrichthyes is composed of 600 spp, divided in two subclasses: Elasmobranchii and Holocephali. Elasmobranchii is made up of the most common cartilaginous fish: rays and sharks. Elasmobranchii has 13 orders:
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Chondrichthyes - Wikipedia, the free encyclopedia
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the jawed vertebrates include the extinct ,armored Placoderms, the cartilaginous fish, and the bony fish (including the tetrapods). ... Learn more about cartilaginous fish from the UCMP.
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Sharks, skates, rays, and even stranger fish make up the Chondrichthyes, or "cartilaginous fish." First appearing on Earth almost 450 million years ago, cartilaginous fish today include both fearsome predators and harmless mollusc-eaters (harmless, that is, unless you are a mollusc).
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Cartilaginous fish such as sharks, skates, and rays are vertebrates whose internal skeleton is made entirely of cartilage and contains no ossified bone. Cartilaginous fish are also known as Chondrichthyes and have one or two dorsal fins, a caudal fin, an anal fin, and ventral fins which are supported by girdles of...
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Cartilaginous fish have very keen senses, and in addition to the senses used by other fish they are able to sense electric impulses from prey-fish that are burrowed in the bottom. While most bony fish breed by shedding egg and milt freely into the water, all cartilaginous fish reproduce through internal fertilization.
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In modern cartilaginous fish, lungs or swimbladder-like structures (which help to keep fish at a certain depth) are absent, and the fish must maintain its level in the sea by the muscular efforts of swimming. Claspers (fins modified for mating) are sometimes present in the male.
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FACT: About half of all Vertebrates are Fish ... ; Guitar Fish Jaws ... Guitar Fish Are Also Known As; banjo shark, fiddler ray, shark ray, shovel-nose ray, white-spotted shovelnose ray.
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