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 7. Arcella excavata Cunningham, 1919 Material examined : Mi-117, 2 ex. , Marakkanam estuary, 05.vii.2012 ; Mi-128, 1 ex. , Coleron estuary, 04.vii.2012 ; Mi-206, 2 ex. , Coleron estuary, 08.xii.2013 ; Mi-243, 2 ex. , Coleron estuary, 20.vii.2014 ; Mi-251, 1 ex. , Kaliveli estuary, 21.vii.2014 ; Mi-258, 2 ex. , Arasalar estuary, 17.vii.2014 . Diagnosis : Test brown in colour; dorsal view slightly oval; aperture slightly oval in shape; aperture bordered by a thin lip; shell surface irregular with several pores; diameter of the test 54-62 µm; aperture diameter 18-22 µm. Distribution in India : Tamil Nadu (present record). This forms new record for India .