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Chondrichthyes

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Chondrichthyes Class of vertebrate animals characterized by a cartilaginous endoskeleton, a skin covered by placoid scales, the structure of their fin rays, and the absence of a bony operculum, lungs, and swim bladder. It includes the subclasses Elasmobranchii (sharks, rays) and Holocephali (ghostfish). The group extends back to the Upper Devonian. See also CARTILAGINOUS FISH.

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AILSA ALLABY and MICHAEL ALLABY. "Chondrichthyes." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 24 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Chondrichthyes." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 24, 2009). http://www.encyclopedia.com/doc/1O13-Chondrichthyes.html

AILSA ALLABY and MICHAEL ALLABY. "Chondrichthyes." A Dictionary of Earth Sciences. 1999. Retrieved December 24, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Chondrichthyes.html

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