1. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Alte Fischerhütte 2, D-16775 Stechlin-Neuglobsow, Germany
2. Government College, Department of Botany, Ajmer 305001 (Rajasthan), India
3. Culture Collection of Algae and Protozoa, Scottish Association for Marine Science, Argyll, UK
4. University of Vienna, Department of Limnology, Althanstr. 14, A-1090 Vienna, Austria