1. Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno , Czech Republic
2. The Czech Academy of Sciences, Institute of Vertebrate Biology, Květná 8, 603 65 Brno , Czech Republic
3. Water Research Group, Unit for Environmental Sciences and Development, North West University, Potchefstroom , South Africa
4. Department of Biodiversity, School of Molecular and Life Sciences, University of Limpopo, Sovenga , South Africa
5. Department of Zoology, Faculty of Science, University of Khartoum , Sudan