1. Institute of Vertebrate Biology of the Czech Academy of Sciences, Brno, Czech Republic; e-mail: , capek@ivb.cz, honza@ivb.cz
2. Department of Biology, George Mason University, Fairfax, VA, USA; e-mail: , lpiston@gmu.edu
3. St. Mary's College of Maryland, St. Mary's City, MD, USA; e-mail:
4. Březová 789/8, 696 18 Lužice, Czech Republic; e-mail: