1. Department of Ecology and Evolutionary Biology and Biodiversity Institute; University of Kansas; Lawrence Kansas 66045 USA
2. Department of Natural Sciences; Peru State College; Peru Nebraska 68421 USA
3. Institute of Biodiversity and Ecosystem Research; Bulgarian Academy of Sciences; Sofia 1113 Bulgaria
4. Institute of Parasitology; Biology Centre of the Academy of Sciences of the Czech Republic; České Budějovice 370 05 Czech Republic
5. Department of Physiology and Neurobiology; University of Connecticut; Storrs Connecticut 06269 USA