1. Functional Morphology and Biomechanics; Zoological Institute; University of Kiel; Am Botanischen Garten 9 D-24098 Kiel Germany
2. Department of Evolutionary Biology; Institute of Zoology; Johannes Gutenberg University Mainz; Johannes-von-Müller-Weg 6 D-55128 Mainz Germany
3. Groesbeeksedwarsweg 300; NL-6521 DW Nijmegen Netherlands
4. Department of Environment & Agriculture; Curtin University; GPO Box U1987 Perth 6845 Australia