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Rhipidistia

A Dictionary of Zoology | 1999 | | Copyright

Rhipidistia (class Osteichthyes, subclass Crossopterygii) A group of ‘tasselfinned’ fish that lived from the Devonian to the Permian Periods. They possessed two dorsal fins, lobate or stalked pectoral and pelvic fins, a heterocercal or diphycercal tail fin, and internal nares. Distantly related to the living coelacanth, they are considered by some to be ancestral to the tetrapod, terrestrial vertebrates (i.e. Amphibia).

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MICHAEL ALLABY. "Rhipidistia." A Dictionary of Zoology. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

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

MICHAEL ALLABY. "Rhipidistia." A Dictionary of Zoology. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Rhipidistia.html

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Rhipidistia

A Dictionary of Earth Sciences | 1999 | | Copyright

Rhipidistia Group of crossopterygian (‘tassel-finned’) fish ranging from the Devonian to the Permian. They possessed two dorsal fins, lobate or stalked pectoral and pelvic fins, and internal nostrils. Distantly related to the living coelacanth, they are considered by some to be ancestral to the Tetrapoda (terrestrial vertebrates).

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Pick a style below, and copy the text for your bibliography.

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AILSA ALLABY and MICHAEL ALLABY. "Rhipidistia." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 1 Jun. 2012 <http://www.encyclopedia.com>.

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

AILSA ALLABY and MICHAEL ALLABY. "Rhipidistia." A Dictionary of Earth Sciences. 1999. Retrieved June 01, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Rhipidistia.html

Learn more about citation styles