The fossilised brain of a three-eyed prawn-like creature that swam the oceans 500 million years ago could prompt a rethink of the evolution of insects and spiders.The creature, named Stanleycaris hirpex, is described as 'the stuff of nightmares'. It had two eyes 'on stalks', with a third in the middle of its head, a formidable-looking circular mouth lined with teeth, and frontal claws with an impressive array of spines.
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