1. Integrative Research Center, Field Museum of Natural History, 1400 South Lake Shore Drive, Chicago, Illinois 60605, U.S.A.,
2. Department of Biology and Burke Museum, University of Washington, Box 351800, Seattle, Washington 98195, U.S.A.
3. CNRS-UMPC-Muséum national d'Histoire naturelle, 8 rue Buffon, CP 38, F-75005 Paris, France,
4. Roy M. Huffington Department of Earth Sciences, Southern Methodist University, Dallas, Texas 75275, U.S.A.,
5. Evolutionary Studies Institute, School for Geosciences, University of the Witwatersrand, Johannesburg, Private Bag 3 Wits 2050, South Africa,
6. Karoo Palaeontology, Iziko South African Museum, P.O. Box 61, Cape Town 8000, South Africa