Proetida

A Dictionary of Earth Sciences | 1999 | 279 words | Copyright

Proetida An order of Trilobita that lived from the Ordovician to Permian. The glabella (see CEPHALON) was large and clearly defined, often with genal spines, the thorax had 8–10 segments, and the pygidium had furrows and was not spiny. The order contained 2 superfamilies.

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AILSA ALLABY and MICHAEL ALLABY. "Proetida." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

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AILSA ALLABY and MICHAEL ALLABY. "Proetida." A Dictionary of Earth Sciences. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Proetida.html

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