1. Rift Valley Research Service, Post Office Box 5717, Addis Ababa, Ethiopia.
2. Laboratory for Human Evolutionary Studies, Museum of Vertebrate Zoology, and Department of Integrative Biology, University of California at Berkeley, Berkeley, CA 94720, USA.
3. Department of Anthropology and Division of Biomedical Sciences, Kent State University, Kent OH 44242, USA.
4. Cleveland Museum of Natural History and
5. Department of Anatomy, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA.
6. University Museum, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.