Studies on the free-living protozoan fauna of estuaries in the coastal zone of Tamil Nadu, India Author Bindu, L. text Records of the Zoological Survey of India 2021 121 1 61 75 journal article 10.26515/rzsi/v121/i1/2021/141506 2581-8686 13186453 5. Arcella dentata Ehrenberg, 1830 Material examined : Mi-217, 3 ex. , Kaduviyar estuary, 06.xii.2013 . Diagnosis : Test circular and pointed or dent like structures arising out evenly from the outer periphery of the test; test light brown in colour; aperture circular and central; diameter of test 115-128µm and aperture diameter 18- 26µm. Distribution in India : Tamil Nadu (present record), Uttar Pradesh , West Bengal .