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A number of studies have been conducted in Sri Lanka for identifying fresh water cyanobacteria based on morphological features, and about 170 cyanobacterial species belonging to 45 genera have been described (Abeywickrama et al., 1986). Microcystis aeruginosa, M. ,. incerta, M. wesenbergi, Cylindrospermopsis, Aphanizomenon, Spirulina, Anabaena aphanizomenoids, , Aphanocapsa, Chroococcus, Gloeocapsa, Nostoc and Coelosphaerium have been frequently recorded from different parts of the country. However, there are no recorded reports on Chroococcidiopsis species from Sri Lanka. Members of the genus Chroococcidiopsis are very primitive, photosynthetic, coccoid cyanobacteria and they have the capability to survive under high radiation, extreme temperatures, osmotic stress and extreme pH values. Genus Chroococcidiopsis have been found in freshwater, marine, hypersaline environments (Dor et al., 1991), hot springs, nitrate caves (Geitler, 1933; Friedmann, 1962), hot and cold deserts, airspaces of porous rocks from Antarctic valleys and in several lichens as cyanobionts (Budel et al., 2000).

First report of genus Chroococcidiopsis (cyanobacteria) from Sri Lanka: a potential threat to human health