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Researchers discovered fossils recently in eastern and central Africa that show formerly unknown human species living between 3.3 and 3.5 million years ago.
The latest has been unearthed in Afar, Ethiopia, according to a paper published online May 27 in the journal Nature.
It's being called Australopithecus deyiremeda, which means "close relative of all later hominins" in the Afar language.
Lead researcher Yohannes Haile-Selassie, of the Cleveland Museum of Natural History, told the BBC, "This new species has very robust jaws. In addition, we see this new species has smaller teeth."
This ancestor appears to be one of four different species of hominins living at the same time, according to the BBC.
(90 day delay due to publisher embargo period)