1. Department of Integrative Biology, University of California, 3040 Valley Life Sciences Building, Berkeley, CA 94720-3140, USA
2. University of California Museum of Paleontology, University of California, 1101 Valley Life Sciences Building, Berkeley, CA 94720-4780, USA
3. Department of Geological Sciences, California State University, Fullerton, CA 92834, USA
4. John D. Cooper Archaeological and Paleontological Center, Santa Ana, CA 92701-6427, USA
5. Department of Earth Sciences, University of Oregon, Eugene, OR 97403-1272, USA
6. University of Oregon Museum of Natural and Cultural History, 1680 E. 15th Avenue, Eugene, OR 97403-1224, USA
7. Paleontological Research Institution, 1259 Trumansburg Road, Ithaca, NY 14850, USA
8. Department of Earth and Atmospheric Sciences, Cornell University, 112 Hollister Drive, Ithaca, NY 14853, USA
9. University of Alaska Museum and Department of Geosciences, University of Alaska Fairbanks, 1962 Yukon Drive, Fairbanks, AK 99775, USA
10. Burke Museum of Natural History and Culture, University of Washington, Box 353010, Seattle, WA 98195-3010, USA
11. California Academy of Sciences, 55 Music Concourse Drive, San Francisco, CA 94118, USA
12. Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA
13. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, PO Box 37012, Washington, DC 20013, USA