1. School of Biological Sciences, Queen's University of Belfast, BT9 7BL, UK
2. Phycology Research Group and Centre for Molecular Phylogenetics and Evolution, Biology Department, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium
3. 1Impasse des Mouettes, 56000 Vannes, France
4. UMR 6540, CNRS, Université de la Méditerranée, Parc scientifique et Technologique de Luminy, F13288 Marseille cedex 9, France