1. Departments of Botany and Zoology; Beaty Biodiversity Research Centre and Museum; University of British Columbia; Vancouver BC V6T 1Z4 Canada
2. Geology and Geophysics Department; Woods Hole Oceanographic Institution; Woods Hole Massachusetts 02543 USA
3. Division of Invertebrate Zoology; American Museum of Natural History; New York New York 10024 USA
4. Institute of Parasitology; Biology Centre; Czech Academy of Sciences and Faculty of Science; University of South Bohemia; 37005 České Budějovice Czech Republic