1. University of Wuerzburg, Biocenter, Zoology II, Emmy-Noether Group, 97074 Würzburg, Germany
2. Stockholm University, Faculty of Science, Department of Zoology, Division of Functional Morphology, 10691 Stockholm, Sweden
3. University of the Witwatersrand, School of Animal, Plant and Environmental Sciences, Wits 2050, South Africa
4. Lund University, Department of Biology, Lund Vision Group, 22362 Lund, Sweden