1. Department of Geosciences; University of Tübingen; Tübingen Germany
2. Department of Geosciences; University of Fribourg; Fribourg Switzerland
3. Paläontologisches Institut und Museum; Universität Zürich; Zürich Switzerland
4. Department of Geology and Geophysics; Yale University; New Haven CT USA
5. Department of Vertebrate Zoology; National Museum of Natural History; Smithsonian Institution; Washington DC USA