1. Department of Vertebrate Zoology and Molecular Systematics Laboratory, Swedish Museum of Natural History, P.O. Box 50007, SE–104 05 Stockholm, Sweden
2. Department of Sciences, Museum Victoria, GPO Box 666E, Melbourne, Victoria 3001, Australia
3. Department of Zoology, University of Oxford, Oxford OX1 3PS, UK
4. Department of Zoology, University of Stockholm, SE–106 91 Stockholm, Sweden