444-year-old fossil belonging to the spider family with gut and brains intact has been found

A 444 million-year-old arthropod fossil, discovered 25 years ago, has been identified. The fossil, named Keurbos susanae, was found in South Africa's Soom Shale. Unusually, it's preserved inside-out, showcasing muscles and guts while lacking its carapace, head and legs. Its exact place in the arthropod family tree remains a mystery.

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