1. Functional Morphology Lab, Dept. Biology, University of Antwerp, Universiteitsplein 1, Antwerp 2610, Belgium
2. Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011-5640, USA
3. Evolutionary Morphology of Vertebrates, Ghent University, K.L. Ledeganckstraat 35, Ghent B-9000, Belgium