1. Department of Paleobiology National Museum of Natural History Smithsonian Institution Washington DC 20560‐0121 USA
2. Department of Biological Sciences Macquarie University Sydney NSW 2109 Australia
3. Institute of Human Origins Arizona State University Tempe AZ 85282 USA
4. School of Human Evolution and Social Change Arizona State University Tempe AZ 85282 USA
5. School of Biological Sciences Monash University Clayton Vic 3800 Australia
6. Geosciences Museum Victoria Melbourne Vic 3100 Australia