Taxonomic studies of marine dinoflagellates and distribution in the coastal waters of Kakinada, Andhra Pradesh, India Author Bhowal, A Zoological Survey of India, Protozoology Section, M Block, New Alipore, Kolkata, West Bengal - 700 053, India & Department of Zoology, University of Calcutta, Kolkata, West Bengal - 700 019, India * [E-mail: jasbose @ gmail. com] Author Purushothaman, J Zoological Survey of India, Protozoology Section, M Block, New Alipore, Kolkata, West Bengal - 700 053, India jasbose@gmail.com Author Siddique, A Zoological Survey of India, Protozoology Section, M Block, New Alipore, Kolkata, West Bengal - 700 053, India & Department of Zoology, University of Calcutta, Kolkata, West Bengal - 700 019, India * [E-mail: jasbose @ gmail. com] text Indian Journal of Geo Marine Sciences 2023 2023-08-31 52 8 390 401 journal article 299611 10.56042/ijms.v52i08.11023 007f04a1-b276-4297-b014-76644398954f 2582-6727 11622455 4. Protoperidinium ovum (J. Schiller) Balech 1974 Diagnostic characters: Thecate dinoflagellate with ovoid shaped body. Apical horn short but prominent, separated from ovoid cell. Presence of two short antapical horns, which run parallel to each other and are slightly curved. Presence of a hypothecal pore. Presence of prominent left sulcal list ( Fig. 2d ). Distribution: Bay of Bengal 12 , Andaman Sea 11 , North Arabian Sea 22 , Mediterranean waters 26 , Black Sea 27 , Mexican waters, Pacific Ocean 33 , Brazil waters 29 , Canary Islands 34 , Australian waters 31 . This species was recorded from the station APK1 (surface waters), APK2, APK3 (subsurface depths), and APK4 (surface and subsurface depths) for the first time in Kakinada waters, and in the state of Andhra Pradesh .