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苔藓动物何时起源？这个困扰学界近百年的谜题，如今找到了答案。《自然》以长文形式在线发表了我国科研团队的一项重要发现，他们在陕西汉中约5.18亿年前的寒武纪早期地层中，找到一批完好的微型苔藓动物化石。这些化石同时保存了矿化骨骼和原位软组织，将这类动物的可靠化石记录从约4.8亿年前的奥陶纪，一下子推到了寒武纪早期，向前跨越了约5000万年，确凿证实了苔藓动物的寒武纪起源。
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