1. Departments of Geological Sciences, Biology, and Anthropology, Indiana University, 1001 E. 10th Street, Bloomington, Indiana 47405, U.S.A.,
2. Department of Biology, Bucknell University, 001 Dent Drive, Lewisburg, Pennsylvania 17837, U.S.A.,
3. Biology Department, University of Massachusetts, 611 North Pleasant Street, Amherst, Massachusetts 01003, U.S.A.,
4. Museum of Comparative Zoology and Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, Massachusetts 02138, U.S.A.,
5. School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, U.K.,
6. Integrative Research Center, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605, U.S.A.,