A fossil reef found in an abandoned quarry in northern Spain contains the remains of ancient spider crabs believed to have lived 100 million years ago. The two types of spider crabs, believed to be the world's oldest on record, were among eight newly discovered species of decapod crustaceans. Researchers have collected fossils from the quarry on various occasions and believe nearly 36 decapod species once existed, making it one of the most diverse places for the creatures in the Cretaceous period.

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