Affiliation: | (1) Department of Biology, McGill University, Montréal, Québec, H3A 1B1, Canada,;(2) Stazione Zoologica "Anton Dohrn", Napoli, Italy,;(3) Present address: Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, BC, V5A 1S6, Canada, e-mail: sandrajwebster@hotmail.com, Tel.: +1-604-291-581, Fax: +1-604-291-3496, |