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‘Oldest Fossil Octopus’ Wasn’t One After All

Pohlsepia mazonensis, a cephalopod species first described in 2000 from a 300-million-year-old specimen and featured in the Guinness Book of Records as the world’s oldest octopus, has been reclassified as a distant relative of nautiluses, reshaping paleontologists’ timeline for when octopuses first evolved.

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