They have a cartilaginous skeleton, but are in the phylum chordata, which is for vertebrates.
http://wiki.answers.com/Q/Do_sharks_have_backbones
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Question No. 7001 : Do sharks have backbones? ... Sharks are vertebrates. They do have a vertebral column, giving them support and protecting their central nervous system. However, they are not bony fishes (or Osteichthyes). They are cartilaginous fishes (or Chondrichthyes).
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www.sci-ctr.edu.sg/ssc/detailed.jsp?artid=1223&type=6&r...
www.sci-ctr.edu.sg/ssc/detailed.jsp?artid=1223&type=6&root=4&parent=4&cat=43
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Fish-shaped ichthyosaurs had strange trunk vertebrae shaped like ashtrays, or hockey pucks, as Sarah at Scientific American suggested (good comparison, don't you think?). This shape is very rare among reptiles, which made scientists wonder what had been going on in the backbones of ichthyosaurs.
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www.ucmp.berkeley.edu/people/motani/ichthyo/vert.html
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Shark glossary explains basic terms about sharks, A. ... Zoom Sharks Shark Glossar ... Sharks are not ray-finned fish.
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www.zoomdinosaurs.com/subjects/sharks/glossary/
www.zoomdinosaurs.com/subjects/sharks/glossary/
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Animals With Backbones ... Most of the animals on Earth are insects. Insects are invertebrates (they don't have backbones). ... Sharks are vertebrate animals, but they don't have bones. They have cartilage. They don't have scales, either. So there.
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dmturner.org/Teacher/Library/4facts.htm
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Learn more about invertebrates of North America and the world. Check out our invertebrate animal section. ... Animal Index - Invertebrates ... Of the million or more animal species in the world, more than 98% are invertebrates. Invertebrates don't have an internal skeleton made of bone. Many invertebrates have a fluid...
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www.kidport.com/RefLib/Science/Animals/AnimalIndexInv.h...
www.kidport.com/RefLib/Science/Animals/AnimalIndexInv.htm
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Put a description of the page here ... But one would expect that the jaws and backbones of large shark species would require relatively more strengthening than those of smaller individuals. In a 1991 paper, shark biologist Guido Dingerkus and his co-workers examined the tesserae of over 50 species of modern sharks.
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www.elasmo-research.org/education/white_shark/skeleton....
www.elasmo-research.org/education/white_shark/skeleton.htm
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Scientistes learned that by caunting growth rings, like tree rinngs, the the cross-sections of sharks backbones. So learning that Great white sharks live to 25 to 30 years.
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www.swanschool.net/classroom/russ/animals/sharkst.htm
www.swanschool.net/classroom/russ/animals/sharkst.htm
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Sharks on the Great Barrier Reef ... Sharks breathe through five to seven gill openings, along each side of the head whereas fishes only have one gill opening per side and this is covered by a protective plate. Sharks have tiny tooth-like scales called 'denticles' embedded in their tough leathery skin whereas fish are...
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www.reefed.edu.au/home/explorer/animals/marine_vertebra...
www.reefed.edu.au/home/explorer/animals/marine_vertebrates/sharks_and_rays/sharks
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