Pteraspidomorphi: Definition and Much More from Answers.com

Wikipedia: Pteraspidomorphi

Pteraspidomorphi
Fossil range: Ordovician - Devonian

Drepanaspis gemuendina, accompanied by Tiaraspis subtilis

Extinct (fossil)

Kingdom:	Animalia
Phylum:	Chordata
Class:	Agnatha
Subclass:	'Pteraspidomorphi'

Orders

Arandaspida
Heterostraci
Thelodontidae
Eriptychiida
Astraspida

Pteraspidomorphi is an extinct subclass of early jawless fish. The fossils show extensive shielding of the head. Some species may have lived in fresh water. The taxon contains the subgroups Heterostraci, Astraspida, Arandaspida and Eriptychiida.

External links

tolweb.org

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Pteraspidomorphi

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Pteraspidomorphi

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		Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved. Read more
		Wikipedia. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pteraspidomorphi". Read more