Scientists Just Found the Missing Denisovans of Southern China

For years, genetics has told us something strange.

People living today in Southeast Asia and Oceania carry substantial amounts of Denisovan DNA — yet confirmed Denisovan fossils have been extraordinarily rare, and a huge geographic gap remained across southwestern China.

Now that gap has started to close.

Researchers examined more than 60,000 bone fragments from Bianfu Cave in China’s Yunnan–Guizhou Plateau. Most were too fragmented to identify by shape, so the team analyzed the ancient proteins preserved inside them. The result: three bone fragments and two teeth were molecularly identified as Denisovan, dating to roughly 167,000–134,000 years ago.

Among them is something particularly valuable: part of a radius — a forearm bone. Until now, scientists had almost no securely identified Denisovan postcranial remains, making it extremely difficult to reconstruct what these mysterious humans actually looked like below the skull.

The cave is now the richest confirmed Denisovan fossil site outside the original Denisova Cave in Siberia. Its location is also tantalizing: southwestern China lies on a natural corridor connecting East Asia, the Tibetan Plateau, South Asia and Southeast Asia — precisely the region through which Denisovan populations may have spread before interbreeding with ancestors of people alive today.

Denisovans were discovered not from a skull, but from DNA in a tiny finger bone.

Sixteen years later, we are still assembling an entire human population almost one fragment at a time.

And proteins are now finding fossils that bones alone could not reveal.

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