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 The opportunity for crabs to form fossils in nature is rare. Crab fossils came from the Paleozoic era hundreds of millions of years ago. Due to environmental or sudden crustal changes, crabs were buried underground without time to escape natural disasters. In the long years to come, very few prehistoric crabs that did not decay encountered suitable environments, and gradually became rocky during the long environmental changes, resulting in the formation of rare crab fossils. Recently, it was reported that Greg Dieter, a paleontologist at Cornell University in the United States, discovered a 20 million year old crab fossil, which will rewrite the evolutionary history of molluscs and advance the history of the ancestors of crabs with curved and serrated claws for hundreds of millions of years.