1Faculty of Science, University of South Bohemia, Branišovská 1760, 370 05 České, Budějovice Czech Republic
2Institute of Parasitology, Biology Centre, Czech Academy of Sciences, Branišovská 31, 370 05 České, Budějovice Czech Republic
3Institute of Vertebrate Biology, Czech Academy of Sciences, Květná 8, 603 65 Brno, Czech Republic
4Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
5Kenya Marine and Fisheries Research Institute, Lake Turkana Station, P.O. Box 205, 30500 Lodwar, Kenya
6Department of Zoology, Faculty of Science, University of Khartoum, 111 15 Khartoum, Sudan
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