1. Department of Palaeobiology, Swedish Museum of Natural History, Stockholm 10405, Sweden
2. Burke Museum of Natural History and Culture, University of Washington, Seattle, WA 98195
3. School of Medicine, University of California, San Francisco, CA 94143
4. Staatliche Naturwissenschaftliche Sammlungen Bayerns-Bayerische Staatssammlung für Paläontologie und Geologie, Munich 80333, Germany
5. Department für Geo- und Umweltwissenschaften, Paläontologie und Geobiologie, Ludwig-Maximilians-Universität, Munich 80333, Germany
6. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
7. Department of Integrative Biology, University of California, Berkeley, CA 94720
8. Department of Integrative Biology, Museum of Paleontology, and Herbarium, University of California, Berkeley, CA 94720