chelicerate :
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- Extinct 'mega claw' creature had spider-like brain
Scientists have discovered the earliest known complete nervous system exquisitely preserved in the fossilized remains of a never-before described creature that crawled or swam in the ocean 520 million years ago. The find solves a long-standing debate as to when the ancestors of chelicerates -- spiders and their kin -- made their first appearance and provides evidence that their biting mouthparts ...
Oct. 16, 2013 - Science Daily