Affiliation: | 1. University of Gothenburg, Department of Zoology, P.O. Box 463, SE‐405 30 Gothenburg, Sweden;2. A.V. Zhirmunsky Institute of Marine Biology, Far East Division, Russian Academy of Sciences, Vladivostok, 690041 Russia;3. Faculty of Science, Hokkaido University, Sapporo 060‐0810, Japan;4. Department of Invertebrate Zoology, Swedish Museum of Natural History, Box 50007, SE‐104 05, Stockholm, Sweden |