Troll Kingdom

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Identify me

This particular image is that of a fossil, from the Jurassic, over 200 million years old. There are only a few hundred known modern forms, but this class of animal was much more numerous both in species and numbers in the past.

clue: 'penta'

I will except the Class of this animal as the answer, unless you figure out the 'penta' clue.
 
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