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 39. Difflugia tuberculata Wallich, 1864 Material examined : Mi-133, 2 ex. , Karaikkal estuary, 06.i.2013 . Diagnosis : Test ovoidal with wide base; pseudostome hexagonal in outline with obtuse angles surrounded by a short collar; test yellowish or chocolate brown, covered with tuberclesor disc shaped protruberances and composed of small platelets perfectly uniting the tubercles; dimension 124-138µm. Distribution in India : Meghalaya , Nagaland , Tamil Nadu , West Bengal .