1. Department of Geosciences, University of Arkansas, Fayetteville, Arkansas 72701, U.S.A., ;
2. Department of Earth and Environmental Science, University of Pennsylvania, 340 South 33rd Street 251 Hayden Hall, Philadelphia, Pennsylvania 19104, U.S.A.;
3. Department of Biology, Indiana University of Pennsylvania, Weyandt Hall Room 114, 975 Oakland Avenue, Indiana, Pennsylvania 15705, U.S.A., ;
4. Department of Geological Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A.,
5. Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, People’s Republic of China, ;
6. Laboratory of Vertebrate Evolution and Fossil Conservation Technology, Gansu Agricultural Unniversity, 1 Yingmencun, Anning District, Lanzhou City, Gansu Province 730070, People’s Republic of China,
7. School of Veterinary Medicine and Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6045, U.S.A.,