Ancient animal’s fossilised brain prompts rethink of spider evolution

A 500-million-year-old sea creature called Mollisonia shared a similar brain structure to modern spiders, suggesting that arachnids first evolved in the sea

​A 500-million-year-old sea creature called Mollisonia shared a similar brain structure to modern spiders, suggesting that arachnids first evolved in the sea A 500-million-year-old sea creature called Mollisonia shared a similar brain structure to modern spiders, suggesting that arachnids first evolved in the sea