Here’s what you’ll learn when you read this story:Researchers studying a fossil site in Ethiopia discovered 13 teeth that they believe come from a never-before-known species of Australopithecus. The team said this reveals that Australopithecus and the oldest Homo ancestors coexisted up to 2.8 million years ago. A new discovery of fossilized teeth in an Ethiopian field has researchers theorizing that they came from a new species of Australopithecus. They dated the teeth to the same period as the oldest known specimens of the genus Homo, found in the same field, upending some traditional theories of human evolution. “We know what the teeth and mandible of the earliest Homo look like, but that’s it,” Villmoare wrote.