An enigmatic phase in human evolution: Australopithecus sediba
The special issue is comprised of nine separate papers analyzing: the skull; vertebral column and thorax; pelvis; upper limb: shoulder, arm and forearm; hand; and lower limb fossils of Au. sediba; along with descriptions of body size and proportions; and walking mechanics, including a 3-D computer animation of Au. sediba walking. The papers are co-authored by leading anthropologists, who are members of the main group of researchers that Berger had assembled for the study of the Malapa material. The research draws on approximately 135 specimens from MH1, MH2 and what may be a third individual, all of which were uncovered between 2008 and 2016.
The researchers find that Au. sediba is in fact a unique species, refuting earlier critics who questioned its validity as a species. Au. sediba is distinct from both Australopithecus africanus, with which it shares a close geographic proximity, and from early members of the genus Homo (e.g., Homo habilis) in both East and South Africa; yet, it also shares features with both groups, suggesting a close evolutionary relationship.
These new research papers address critiques of Au. sediba from other colleagues while correcting some initial observations and testing new ideas regarding this extraordinary collection. For example, other researchers hypothesized that this was more than one species due to the differences in the size and shape of the vertebrae. "The differences in these vertebrae can simply be attributed to their developmental age differences: the juvenile individual's vertebrae have not yet completed growth, whereas the adult's vertebra growth is complete," explained co-editor Scott A. Williams, an associate professor of anthropology in the Center for the Study of Human Origins at New York University, and co-author of two of the papers, including the one on the vertebral column.
The special issue also finds that Au. sediba was well adapted to terrestrial bipedalism or walking on just two feet but also spent significant time climbing in trees, perhaps for foraging and protection from predators. This larger picture sheds light on the lifeways of Au. sediba and also (whether directly or indirectly) on a major transition in hominin evolution, that of the largely ape-like species included broadly in the genus Australopithecus to the earliest members of our own genus, Homo.
The vertebrae, ribs, and sternum of Australopithecus sediba (Williams, S.A., Meyer, M.R., Nalla, S., García-Martínez, D., Nalley, T.K., Eyre, J., Prang, T.C., Bastir, M., Schmid, P., Churchill, S.E., and Berger, L.R.)
Provided by Chaffey College