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Chinese-led team uncovers oldest known body fossils of ringed worms_蜘蛛资讯网

tion in Northwest China's Shaanxi Province. The site dates to about 535 million years ago, the earliest stage of the Cambrian Period, a critical interval when most major animal groups first appeared a

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ng HuaqiaoAn international research team led by Chinese scientists has discovered the oldest known body fossils of annelids, extending the evolutionary record of a major animal group by more than 10 m

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