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Ancient fossilised brains give insight into the evolution of insects and spiders

These 500 million-year-old arthropods had three eyes and a segmented brain

Pair of fossil specimens of Stanleycaris hirpex, which had intact brains
Pair of fossil specimens of Stanleycaris hirpex, specimen ROMIP 65674.1-2. Credit Jean-Bernard Caron/ © Royal Ontario Museum
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