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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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www.amnh.org/exhibitions/hall_tour/spectrum/17.html
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UCMP Berkeley's introduction to the cartilaginous fish, including sharks. ... 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...
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www.ucmp.berkeley.edu/vertebrates/basalfish/chondrintro...
www.ucmp.berkeley.edu/vertebrates/basalfish/chondrintro.html
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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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users.tamuk.edu/kfjab02/Biology/Vertebrate%20Zoology/b3...
users.tamuk.edu/kfjab02/Biology/Vertebrate%20Zoology/b3405_ch07.htm
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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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www.angelfire.com/mo2/animals1/fish/shark.html
www.angelfire.com/mo2/animals1/fish/shark.html
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Chondrichthyes - Wikipedia, the free encyclopedia
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Chondrichthyes (pronounced /kɑːnˈdrɪk.θiːˌiːz/ ) or cartilaginous fishes are jawed fish with paired fins, paired nares, scales, two-chambered hearts, and skeletons made of cartilage rather th...
en.wikipedia.org/wiki/Chondrichthyes
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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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www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0...
www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0065153.html
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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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www.tampabayaquarium.com/animals/cartilaginousfish.htm
www.tampabayaquarium.com/animals/cartilaginousfish.htm
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Here we examine fin development in embryos of the primitive cartilaginous fish, Scyliorhinus canicula (dogfish) using scanning electron microscopy and investigate expression of genes known to be involved in limb positioning, identity and patterning in higher vertebrates.
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www.nature.com/doifinder/10.1038/416527a
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Here we examine fin development in embryos of the primitive cartilaginous fish, Scyliorhinus canicula (dogfish) using scanning electron microscopy and investigate expression of genes known to be involved in limb positioning, identity and patterning in higher vertebrates.
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www.nature.com/nature/journal/v416/n6880/abs/416527a.ht...
www.nature.com/nature/journal/v416/n6880/abs/416527a.html
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