A total of fifty-two foraminiferal species belonging to 23 genera and 16 families were recorded from Arasalar estuary for a period of one year (July 2000 to June 2001). Miliammina fusca, Quinqueloculina agglutinans, Q. seminula, Cibicides refulgens, Ammonia beccarii, Elphidium clavatum, E. incertum are the abundant species. Due to marine water influence the number and populations of foraminifera was high during summer and premonsoon seasons. The various ecological parameters such as temperature, salinity, pH, dissolved oxygen of bottom water and sediment organic matter were studied. Salinity is the key factor for governing distribution and abundance of foraminifera of this estuary.
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