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 3. Arcella conica (Playfair, 1918) Material examined : Mi-115, 7 ex. , Pichavaram, 04.vii.2012 ; Mi-126, 4 ex. , Coleron estuary, 04.vii.2012 ; Mi-161, 3 ex. , Vellar estuary, 20.vi.2013 ; Mi-241, 2 ex. , Vellar estuary, 20.vii.2014 ; Mi-283, 1ex. , Vellar estuary, 20.vii.2014 . Diagnosis : Test oblique, slightly oval and angular in front view; mouth circular, proportionately small; diameter 92- 98µm; aperture width 18 to 26µm. Distribution in India : Andhra Pradesh , Arunachal Pradesh , Tamil Nadu (present record), West Bengal .