A skull, unearthed nearly a century ago, has led to new revelations in the study of human evolution. 

Referred to as “Dragon Man,” the fossil has recently been recognized as part of the Denisovans – a puzzling group of early humans that were initially discovered through genetic research in 2010.

“I really feel that we have cleared up some of the mystery surrounding this population,” Qiaomei Fu, a researcher who was a part of the 2010 discovery team and led the new study, told CNN.

“After 15 years, we know the first Denisovan skull.”

The findings also provide a glimpse into what the Denisovans may have looked like. Scientists have reconstructed an artist’s impression of “Dragon Man,” showing a robust, blocky face with strong brow ridges, a feature common in other ancient human species.

With a brain size comparable to both Neanderthals and modern humans, Denisovans would have had a physically powerful appearance, likely adapted to the harsh environments they inhabited. 

The “Dragon Man” skull, which dates to 146,000 years ago and was discovered in 1933 by a laborer in Harbin City, China — when it was under Japanese occupation — was long shrouded in mystery.

The worker had found the cranium while building a bridge, but rather than handing it over to science, he stashed it at the bottom of a well, where it remained untouched for decades until his death in 2018. His family then donated it to Hebei GEO University, CNN reported.

With the discovery of this nearly complete skull, scientists have finally pieced together a face for the Denisovans, offering new insights into the history of humanity. 

In 2021, scientists first proposed that the skull might belong to a new species of human, naming it Homo longi, or “Dragon Man,” which is derived from Heilongjiang, or Black Dragon River, the province where the it was found.

The skull’s unusual features — such as its massive brow ridges and broad, low face—were unlike those of any previously known human species. However, as exciting as this discovery was, it raised many questions. 

The mystery deepened as researchers struggled to extract DNA from the skull, which had been buried for so long. Despite several attempts, initial efforts to analyze its genetic material proved unsuccessful.

It wasn’t until scientists turned to a different source — dental plaque — that they found the breakthrough they needed.

The DNA pointed to a surprising connection to the Denisovans, an ancient human group that had been identified through a tiny pinky bone found in a Siberian cave over a decade ago. The discovery of this fossil marked the first evidence of Denisovans outside of their original home in Siberia. 

Until now, no complete Denisovan skull had ever been found, leaving researchers with only small pieces of the puzzle to work with. The “Dragon Man” skull changes that, providing a much-needed clue to help scientists piece together what these ancient relatives might have looked like.

The new research, published in two groundbreaking papers in Cell and Science, not only provided mitochondrial DNA evidence but also revealed protein fragments extracted from the skull that further cemented its Denisovan identity.

The analysis of these proteins showed a clear match to known Denisovan traits, confirming the connection beyond doubt.

The “Dragon Man” discovery adds a new layer to our understanding of human evolution, shedding light on a period when multiple human species roamed the Earth. 

Denisovans, Neanderthals, and early Homo sapiens coexisted and even interbred, leaving behind traces of their DNA in modern humans. In fact, many people today carry small amounts of Denisovan DNA, a legacy of these ancient encounters.