1. Museum für Naturkunde, Leibniz-Institut für Evolutions- und Biodiversitätsforschung, Invalidenstraße 43, 10115 Berlin, Germany
2. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, U.K.,
3. Department of Earth & Environmental Sciences, University of Michigan, 1100 North University Avenue, Ann Arbor, Michigan 48109-1382, U.S.A., ,
4. Museum of Paleontology, University of Michigan, 1105 North University Avenue, Ann Arbor, Michigan 48109-1382, U.S.A.
5. School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham B15 2TT, U.K.,
6. Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK