An ancient skull found in China has shifted the story of human evolution, suggesting our family tree branched much earlier than scientists thought. A study led by Xiaobo Feng of the School of History and Culture at Shanxi University reports that the million-year-old fossil from Yunxian, Hubei province, belongs to a lineage that split from modern humans about 1.3 million years ago.
The finding, published Thursday in the journal Science, pushes back the origin of key Homo groups by roughly 400,000 years.
The partial skull, labeled Yunxian 2, was pulled from river-terrace sediments along the Hanjiang River in the late 1980s. It rested near stone tools and the bones of extinct elephants and rhinos, hinting at a once-rich ecosystem on the Chinese plains.
Heavy pressure from overlying earth warped the bone, leaving its true shape hidden behind cracks and bends. Several earlier attempts to read the fossil stalled because the damage masked both its outline and many small surfaces.
Technology unlocks secrets of a damaged skull
Feng’s team turned that obstacle into an advantage. They fed thousands of CT slices into new software that can tag fossil fragments, strip away the rocky matrix and slide pieces back into place like a 3-D jigsaw.
The program even compensated for crushed sections by mirroring the undamaged side of the skull. The result is a near-complete virtual cranium that can be rotated, measured and compared without risk to the original.
When the layers fell away, a striking pattern emerged. The braincase holds about 1,143 cubic centimeters (69.75 cubic inches)—larger than earlier Homo erectus yet smaller than today’s average.
Yunxian 2 skull was found in June 1990 at Xuetangliangzi site on the left bank of Han River. New reconstruction of one-million-years-old skull shows transitional features close to the origins of the Denisovans and Homo sapiens lineages #FossilFriday pic.twitter.com/s3Ex144jnO
— Odyssey to the Far East (@motherlander) September 26, 2025
Its brow ridge is thick and its face juts forward like older species, but other traits look more modern, including a higher cheek region and a reduced ridge at the back of the head.
That mosaic, the authors conclude, marks it as an early member of the Homo longi clade, a group that also includes the mysterious Denisovans.
Clues point to new branch in human lineage
The researchers plotted 533 anatomical landmarks from Yunxian 2 against 178 other fossils and living people.
In that three-dimensional map, the Chinese specimen clustered with Asian mid-Pleistocene crania such as Harbin, Dali and Jinniushan, standing apart from both Neanderthals and Homo sapiens.
Statistical modeling placed it deep inside the H. longi branch, which the study considers a sister to the sapiens line.
Advanced statistical dating tests traced the split between the two branches to about 1.32 million years ago, long before earlier genetic estimates of 500,000 to 700,000 years.
That deeper divide implies that Denisovans, Neanderthals and modern humans each walked separate evolutionary tracks for a far longer span than once believed.
It also hints that the genetic mixing seen in later skeletons happened among groups that had already traveled distinct paths.
Yunxian skull reveals transitional features
Feng and colleagues write that Yunxian 2 lies close to the last common ancestor of our own species and H. longi. They argue that its mix of primitive and modern features captures a pivotal moment in the rise of later humans.
Outside experts called the work a welcome step toward sorting the tangle of mid-Pleistocene fossils.
Robin Dennell, a paleontologist not involved in the study, said the careful digital reconstruction sets a new benchmark for reviving crushed remains, though he urged caution in assigning hard species names until more bones turn up.
The study shows how digital forensics can rescue information from ancient relics and rewrite textbooks. With the Yunxian skull now restored, researchers plan to excavate deeper layers at the site and analyze the newly found Yunxian 3 cranium. They aim to test whether it shares the same longi signature or represents yet another branch.
