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HomeOtherFossil Friday

#Fossil Friday: Ordovician Edrioasteroidea

Mihai Andrei byMihai Andrei
January 29, 2016 - Updated on January 30, 2016
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Image via Wiki Commons
The fossil comes from the Bellevue formation in Ohio. Image via Wiki Commons

This is Streptaster vorticellatus, a member of the Edrioasteroidea class. The Edrioasteroidea is an extinct class of echinoderms that lived all the way on from the Ediacaran period 600 million years ago! However, Streptaster vorticellatus lived “only” 450 million years ago, during a period called the Ordovician. The body plan for this class was simple: a main body (theca), composed of many small plates, a peripheral rim for attachment, and (in some species) a pedunculate zone for extension and retraction.

 

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Mihai Andrei

Mihai Andrei

Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.

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