1. Faculty of Petroleum and Minerals, Al Neelain University, Khartoum, Sudan
2. Department of Natural History, Royal Ontario Museum, Toronto, Canada
3. Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Canada
4. Technische Universität Berlin, Angewandte Geowissenschaften, Berlin, Germany
5. Steinmann Institute, Division of Paleontology, University of Bonn, Bonn, Germany
6. Museum Für Naturkunde, Leibniz-Institut Für Evolutions- Und Biodiversitätsforschung Invalidenstr, Berlin, Germany