1. Florida Museum of Natural History, Dickinson Hall, 1659 Museum Road, Gainesville, FL 32611-7800, USA
2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, Jiangsu, PR China
3. University of Science and Technology of China, Hefei, Anhui, 230026, PR China
4. Department of Paleobiology, NHB 121, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
5. Yale School of the Environment, 195 Prospect Street, Yale University, New Haven, CT 06511-2387, USA
6. Oak Spring Garden Foundation, 1776 Loughborough Lane, Upperville, VA 20184, USA