Solar saltpans are ponds of brine sun evaporated to crystallize salt (Halite). Once provide ambient ecology for several halophilic microalgae. Enumeration of microorganisms in Thoothukudi solar saltpans revealed the presence of 30 genera of microalgae belonging to the divisions of Cyanophyta, Bacillariophyta and Chlorophyta. Chlorophyta species is the dominant group of solar salterns of Thoothukudi.
Key words: Solar saltpans, halophilic microalgae, diversity, salt production and Thoothukudi.