1. Lund Vision Group, Department of Biology, Lund University, Sölvegatan 35, 223 62 Lund, Sweden
2. Zoology II, Biozentrum, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
3. Department of Biology, Biotechnical Faculty, University of Ljubljana, SI-1000 Ljubljana, Slovenia
4. School of Animal, Plant and Environmental Sciences, University of the Witswatersrand, 1 Jan Smuts Avenue, Braamfontein, Johannesburg 2000, South Africa