1. Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131;
2. Department of Geological Sciences, Stanford University, Stanford, California 94305
3. Department of Integrative Biology, University of California, Berkeley, California 94720
4. Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611
5. Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560
6. National Evolutionary Synthesis Center, Durham, North Carolina 27705
7. Department of Biology, Duke University, Durham, North Carolina 27708
8. Department of Biological Sciences, Benedictine University, Lisle, Illinois 60532
9. Department of Biology and Natural Resources, Northland College, Ashland, Wisconsin 54806
10. Department of Mathematics and Statistics, Swarthmore College, Swarthmore, Pennsylvania 19081