1. Department of Applied Mathematics, Research School of Physics, Australian National University, Canberra, Australia;
2. Australian Museum Research Institute, Sydney, Australia;
3. 159 Millynn Rd, Bywong, NSW 2621, Australia;
4. Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, PR China;
5. Centre of Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Beijing, PR China;
6. 52 Daintree Crescent, Kaleen, ACT 2617, Australia