A digital reconstruction of a million-year-old skull suggests humans may have diverged from our ancient ancestors 400,000 years earlier than previously thought and in Asia not Africa, a new study said yesterday.
The findings are based on a reconstruction of a crushed skull discovered in China in 1990, and have the potential to resolve the longstanding “Muddle in the Middle” of human evolution, researchers said.
The skull, labelled Yunxian 2, was previously thought to belong to a human forerunner called Homo erectus.
Photo: Reuters
But modern reconstruction technologies used by a group of researchers found features that are closer to species previously thought to have existed only later in human evolution, including the recently discovered Homo longi and our own Homo sapiens.
“This changes a lot of thinking,” said Chris Stringer, an anthropologist at the Natural History Museum, London, who was part of the research team.
“It suggests that by one million years ago, our ancestors had already split into distinct groups, pointing to a much earlier and more complex human evolutionary split than previously believed,” he added.
If the findings are correct, it suggests there could have been much earlier members of other early hominins, including Neanderthals and our own Homo sapiens line.
But it also “muddies the waters” on longstanding assumptions that early humans dispersed from Africa, said Michael Petraglia, director of Griffith University’s Australian Research Centre of Human Evolution, who was not involved in the study.
“There’s a big change potentially happening here, where east Asia is now playing a very key role in hominin evolution,” he said.
The research, published in the journal Science, used advanced CT scanning, structure light imaging and virtual reconstruction techniques to model a complete Yunxian 2.
The scientists relied in part on another similar skull to shape their model, and then compared it to over 100 other specimens.
The resulting model “shows a distinctive combination of traits,” the study said, some of them similar to Homo erectus, including a projecting lower face.
But other aspects, including its apparently larger brain capacity, are closer to Homo longi and Homo sapiens, the researchers said.
“Yunxian 2 may help us resolve what’s been called the ‘Muddle in the Middle,’ the confusing array of human fossils from between 1 million and 300,000 years ago,” Stringer said in a press release.
Much about human evolution remains debated, and Petraglia said the study’s findings were “provocative” though grounded in solid work.
“It’s sound, but I think the jury’s still out. I think there will be a lot of questions raised,” he said.
The findings are only the latest in a string of recent research that has complicated what we thought we know about our origins.
Homo longi, also known as “Dragon Man,” was itself only named as a new species and close human relative in 2021.
The authors said their work illustrates the complexity of our shared history.
“Fossils like Yunxian 2 show just how much we still have to learn about our origins,” said Stringer.
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