Vertebrate Zoology

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Elasmobranchii

A Dictionary of Earth Sciences | 1999 | | 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. 27 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O13-Elasmobranchii.html

AILSA ALLABY and MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Earth Sciences. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Elasmobranchii.html

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Elasmobranchii

A Dictionary of Zoology | 1999 | | 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. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O8-Elasmobranchii.html

MICHAEL ALLABY. "Elasmobranchii." A Dictionary of Zoology. 1999. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Elasmobranchii.html

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elasmobranch

The Columbia Encyclopedia, 6th ed. | 2011 | 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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"elasmobranch." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"elasmobranch." The Columbia Encyclopedia, 6th ed.. 2011. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1E1-elasmobr.html

"elasmobranch." The Columbia Encyclopedia, 6th ed.. 2011. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1E1-elasmobr.html

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Elasmobranchii

A Dictionary of Biology | 2004 | Copyright

Elasmobranchii See Chondrichthyes.

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"Elasmobranchii." A Dictionary of Biology. 2004. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

"Elasmobranchii." A Dictionary of Biology. 2004. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O6-Elasmobranchii.html

"Elasmobranchii." A Dictionary of Biology. 2004. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O6-Elasmobranchii.html

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