1. Zoological Institute, University of Basel, 4051 Basel, Switzerland;
2. National Museum of Natural History, Smithsonian Institution, Washington, DC 20013;
3. Department of Geology and Soil Science, Ghent University, 9000 Ghent, Belgium
4. Department of Animal Ecology and Systematics, Justus Liebig University Giessen, D-35392 Giessen, Germany
5. Department of Geosciences, University of Arizona, Tucson, Arizona 85721;