1 Faculty of Science, University of South Bohemia in Ceske Budejovice, Ceske Budejovice, Czech Republic.
2 Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Ceske Budejovice, Czech Republic.
3 Faculty of Science, University of South Bohemia in Ceske Budejovice, Ceske Budejovice, Czech Republic; Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Ceske Budejovice, Czech Republic. Electronic address: jalovecka@prf.jcu.cz.