1. Department of Biology, San Diego State University, San Diego, CA 92182–4614, USA.
2. Department of Integrative Biology and Museum of Paleontology, University of California, Berkeley, CA 94720–3140, USA.
3. Jackson School of Geosciences, University of Texas, Austin, TX 78712, USA.
4. Department of Palaeontology, The Natural History Museum, London SW7 5BD, UK.
5. Department of Earth and Enviromental Science, University of Portsmouth, Portsmouth, Hants PO1 3QL, UK.
6. Museum of Paleontology, University of California, Berkeley, CA 94720–4781, USA.
7. Department of Paleobiology, National Museum of Natural History, Washington, DC 20013–7012, USA.
8. Department of Geoscience, Hobart and William Smith Colleges, Geneva, NY 14456, USA.
9. Museum of the Rockies, Montana State University, Bozeman, MT 59717, USA.
10. Department of Biology, University of Washington, Seattle, WA 98195–1800, USA.
11. Department of Geoscience, University of Iowa, Iowa City, IA 52242, USA.
12. Raymond M. Alf Museum of Paleontology, Claremont, CA 91711, USA.
13. Department of Geology and Geological Engineering, University of North Dakota, Grand Forks, ND 58202–8358, USA.
14. Royal Tyrrell Museum, Drumheller, AB T0J 0Y0, Canada.
15. School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK.
16. Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada.
17. Department of Anatomy and Cell Biology, Oklahoma State University Center for Health Sciences, Tulsa, OK 74107, USA.
18. Department of Geology, University of Delhi, Delhi 110 007, India.
19. InfoQuest Foundation, 160 Cabrini Boulevard, No. 48, New York, NY 10033, USA.
20. Institut de Physique du Globe de Paris, 75251 Paris, France.
21. Department of Earth Sciences, Indian Institute of Technology, Roorkee 247667 (Uttarakhand), India.
22. Department of Earth and Environmental Sciences, Medway Campus, University of Greenwich, Chatham, Kent ME4 4AW, UK.
23. Centre of Advanced Study in Geology, Lucknow University, Lucknow 226001, India.