Fossil jawbone with distinctly hominid teeth Photo: Arizona State University/Kaye Reed |
A fossil lower jawbone with five intact teeth, discovered in 2013 in the Afar region of Ethiopia, may well have pushed back the earliest known hominid by about 400,000 years to 2.8 million years ago. The huge significance of this, if it turns out to be true, is that it sits neatly in time and place between the undoubtedly australopithecine Australopithecus afarensis from the same area about 3 million years ago and the undoubtedly hominid Homo habilis, from about 2.4 million years ago, previously the earliest known hominid.
The key to this new find is the distinctly hominid small teeth. In our evolutionary history, teeth reduced in size