Pteraspidomorphi

A Dictionary of Zoology | 1999 | 352 words | Copyright

Pteraspidomorphi (superclass Agnatha) A class of jawless vertebrates that have an eel-like body, lack paired fins, have two semicircular canals, and a skeleton not consisting of true bone. The class includes the fossil order Pteraspidiformes, and the extant Myxiniformes (hagfish). Some authors place the Myxiniformes with the class Cephalaspidomorphi.

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MICHAEL ALLABY. "Pteraspidomorphi." A Dictionary of Zoology. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Pteraspidomorphi." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O8-Pteraspidomorphi.html

MICHAEL ALLABY. "Pteraspidomorphi." A Dictionary of Zoology. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-Pteraspidomorphi.html

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