elasmobranch

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elasmobranch

The Columbia Encyclopedia, Sixth Edition | 2008 | The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press. (Hide copyright information) Copyright

elasmobranch , cartilaginous fish, member of the subclass Elasmobranchii of the vertebrate class Chondrichthyes (see Chordata ). This group includes sharks , skates, and rays .

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Elasmobranchii

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

Elasmobranchii (class Chondrichthyes) A subclass of shark-like fish that have five–seven gill slits, fairly rigid fins, placoid scales, a spiracular opening behind the jaws, numerous teeth, and claspers on the ventral fins of the male. Modern elasmobranchs have a cartilaginous skeleton. Apart from modern sharks and rays, the subclass also includes many fossil species.
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MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Zoology. 1999. Encyclopedia.com. 3 Dec. 2009 <http://www.encyclopedia.com>.

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Elasmobranchii

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

Elasmobranchii Subclass of shark-like fish. They have 5–7 gill slits, fairly rigid fins, placoid scales, a spiracular opening behind the jaws, numerous teeth, and claspers on the ventral fins of the male. Elasmobranchs have a cartilaginous skeleton and their fossil record consists mainly of teeth and fin rays. Well-known fossil genera include Cladoselache (Devonian), and Ctenacanthus (Upper Devonian to Lower Permian). See CARTILAGE; and CARTILAGINOUS FISH.
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AILSA ALLABY and MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 3 Dec. 2009 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 3, 2009). http://www.encyclopedia.com/doc/1O13-Elasmobranchii.html

AILSA ALLABY and MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Earth Sciences. 1999. Retrieved December 03, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Elasmobranchii.html

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elasmobranch. (Image by Terry Goss, GFDL)

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