WASHINGTON Two skeletons nearly 2 million years old and unearthed in South Africa are part of a previously unknown species that scientists say fits the transition from ancient apes to modern humans.
The fossils bear traits from both lineages, and researchers have named them Australopithecus sediba, meaning “southern ape, wellspring,” to indicate their relation to earlier apelike forms and to features later found in more modern people.
“These fossils give us an extraordinarily detailed look into a new chapter of human evolution and provide a window into a critical period when hominids made the committed change from dependency on life in the trees to life on the ground,” said Lee R. Berger of South Africa’s University of Witwatersrand. “Australopithecus sediba appears to present a mosaic of features demonstrating an animal comfortable in both worlds.”