Vertebrate Zoology

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Placodermi

A Dictionary of Earth Sciences | 1999 | | Copyright

Placodermi Class of archaic, jawed (gnathostome), and heavily armoured fish, which appeared in the Devonian and which were virtually extinct by the end of that period. They were rather diverse in body form. They all possessed a head shield formed by bony plates. Pectoral and pelvic fins appear to have been present. Most of them (e.g. Coccosteus) were bottom-dwelling fish, with a depressed body terminating in a heterocercal tail.

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

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

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

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Placodermi

A Dictionary of Zoology | 1999 | | Copyright

Placodermi A class of archaic, jawed (gnathostome), and heavily armoured fish, which appeared in the Devonian Period and which were virtually extinct by its end. They were rather diverse in body form. They all possessed a head shield formed by bony plates. Pectoral and pelvic fins appear to have been present. Most of them were bottom-dwelling, with a depressed body terminating in a heterocercal tail.

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

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

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

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

Learn more about citation styles