1. Section Palaeontology, Institute of Geosciences, Rheinische Friedrich-Wilhelms-Universität Bonn, Nussallee 8, D-53115 Bonn, Germany,
2. School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen’s Road, BS8 1RJ Bristol, United Kingdom,
3. Earth Science Department, The Natural History Museum, Cromwell Road, London, SW7 5BD, United Kingdom,
4. Jernvall EvoDevo Laboratory, Institute of Biotechnology, University of Helsinki, P.O. Box 56, FIN-00014 Helsinki, Finland,