Australopithecine
Orrorin, at 6.1 to 5.7 mya is known from 20 pieces of bone, and its relationships are unclear. Orrorin is both earlier, by almost 3 million years, and more similar to modern humans than is A. afarensis. The main similarity is that the Orrorin femur is morphologically closer to that of H. sapiens than is Lucy's; there is, however, some debate over this point.