1. Department of Vertebrate Paleontology, Natural History Museum of Los Angeles County, Los Angeles, CA, USA
2. Key Laboratory of Vertebrate Evolution and Human Origins, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China
3. Centro de Geociencias, Universidad Nacional Autónoma de Mexico, Juriquilla, Querétaro, Mexico
4. Department of Integrative Biology and Museum of Paleontology, University of California, Berkeley, CA, USA