1. Department of Palaeontology, National Museum Prague, Václavské nám. 68, 115 79, Praha 1, Czech Republic;, Email: jiri_kvacek@nm.cz
2. Department of Evolution and Ecology, University of California, Davis, California 95616, U.S.A
3. Department of Evolutionary and Systematic Botany, University of Zurich, Zollikerstrasse 107, 8008 Zurich, Switzerland
4. CNRS-UMR 5276 Laboratoire de Géologie de Lyon – Terre, Planètes, Environnement, Université Lyon 1 (Claude Bernard), Observatoire de Lyon, 69622 Villeurbanne, France
5. A.A. Borissiak Paleontological Institute, Profsojuznaya str. 123, Moscow 117647, Russia