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Natural History: ​Ancient Skull Discovery Pushes Human Origins Back Over a Million Years

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26 September 2025
By James Hamilton

Discussion and comparison. Credit: Mr. Guanghui Zhao

​Our story as a species may be far older, and more tangled, than scientists once believed. A newly reconstructed fossil skull from central China suggests that the evolutionary roots of modern humans stretch back more than one million years, pushing our origins some 400,000 years earlier than previous genetic estimates indicated.
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At the heart of this breakthrough is Yunxian 2, a skull unearthed in Hubei Province in 1990. For decades, the fossil was thought to represent Homo erectus, one of our early human relatives. But thanks to cutting-edge scanning and digital reconstruction, an international team of researchers has revealed something surprising: Yunxian 2 doesn’t belong to erectus at all, but rather to the so-called “longi clade,” a lineage closely related to the mysterious Denisovans.
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A Skull With a Mixed Heritage
The reconstructed skull shows a fascinating blend of features. Its large, squat braincase and forward-jutting lower face recall more primitive humans, while the shape of the rear skull and its relatively large brain capacity echo later species such as Homo longi (nicknamed “Dragon Man”) and even Homo sapiens.

“The discovery shows that by a million years ago, our ancestors had already split into distinct groups,” said Professor Chris Stringer of London’s Natural History Museum, a co-author of the study. “That means human evolution was both earlier and more complex than we previously believed.”

Rethinking Our Origins
​The findings, published in Science, challenge long-standing ideas about how our species fits into the human family tree. According to the new analysis, the past 800,000 years of human evolution can be traced to just five major lineages: Asian erectus, heidelbergensis, longi, sapiens, and neanderthalensis. Crucially, these groups appear to have already started branching off over a million years ago.

This reshuffling of the timeline raises bigger questions. Did these early lineages first emerge in Africa, as long assumed, or did multiple regions - including Asia - play a role? And how do these discoveries mesh with genetic studies suggesting a tangled web of interbreeding among early humans?

Solving the “Muddle in the Middle”
​For palaeoanthropologists, Yunxian 2 could help clarify what’s been called the “Muddle in the Middle” - the confusing patchwork of fossils dated between one million and 300,000 years ago. The newly restored skull provides a vital data point for mapping out when and how different human branches diverged.

“This reconstruction is a crucial step in building a reliable framework for understanding human evolution,” said Professor Xijun Ni of the Chinese Academy of Sciences, who led the project.
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As scientists continue to uncover fossils and refine their techniques, one thing is clear: the story of our origins is far older and far more complex than we ever imagined.

Fossils and replicates. Credit: Mr. Guanghui Zhao

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