Replica of the phalanx. It was destroyed to investigate the mtDNA.

Denisovans: Another Species Discovered

DNA from a tiny bone found in a Siberian cave is from a previously unknown species and is identical to indigenous modern humans of the western Pacific.

It is thought that between 300,000 to 400,000 years ago, an ancestral group of H. heidelbergensis left Africa and then split shortly after. One branch ventured northwestward into Western Asia and Europe and became the Neanderthals. The other branch moved east, becoming Denisovans.

photo of Denisovan pinky bone

Photo of pinky bone ©Max Planck Institute

Discoveries at a cave in southern Siberia called Denisova, after an 18th century hermit occupant, led scientists to examine forensic evidence of early habitation by both Neanderthals and H. sapiens, and a few small bones of a species that was new.

The cold temperatures in the caves preserved genetic material, which allowed an analysis of the DNA taken from the pinky bone of a girl found at Denisova. This child, who lived about 40,000 years ago, was possibly from an unknown species of human. More surprisingly, her DNA matched about 4% to 6% of the DNA of the modern humans indigenous to Australia, Melanesia, and other areas of the western Pacific.

This distribution suggests that these “Denisovans” had journeyed as far away as Southeast Asia, where they must have interbred with modern humans.

inuit women

Cold Tolerance among Inuit May Come from Extinct Human Relatives

Steph Yin, New York Times

Gene variants that might give Inuit in Greenland more heat-generating capacity match up with DNA found in Denisovans, an extinct group of ancient humans.

3 skulls

Ancestors of Modern Humans Interbred With Extinct Hominins, Study Finds

Carl Zimmer, New York Times

Interbreeding may have given modern humans genes that bolstered immunity to pathogens.

Featured Books

The Gap

The Science of What Separates Us from Other Animals

Thomas Suddendorf

A leading research psychologist concludes that our abilities surpass those of animals because our minds evolved two overarching qualities.

Before the Dawn

Recovering the Lost History of Our Ancestors

Nicholas Wade

New York Times science writer explores humanity’s origins as revealed by the latest genetic science.

Related:

Our Hominid Predecessors
Australopithecines
Homo Habilis
Homo Ergaster/Erectus
Homo Heidelbergensis
Homo Neanderthalensis
Homo Floresiensis
Homo Sapiens

Further Reading

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