1. Biology Department, Unit of Ecology & Systematics, Vrije Universiteit Brussel Pleinlaan 2, B-1050, Brussels, Belgium E-mail: fbossuyt@vub.ac.be
2. Section of Integrative Biology and Texas Memorial Museum, The University of Texas at Austin Austin, Texas, 78712, USA
3. Section of Integrative Biology and Center for Computational Biology and Bioinformatics, University of Texas Austin, Texas, 78712, USA
4. Laboratory of Evolutionary Genetics, Université Libre de Bruxelles (ULB), C.P. 300, Institute for Molecular Biology and Medicine Rue Jeener & Brachet 12, B-6041, Gosselies, Belgium