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 11. Tripos trichoceros (Ehrenberg) F. Gómez, 2013 Diagnostic characters: Thecate dinoflagellate with small, almost flat, subtrapezoidal body. Presence of thin elongated apical and antapical horns. Apical horn straight and long. Antapical horns bend at an angle and run lateral-posteriorly. Due to the bend, a shallow notch is formed between the proximal parts of the antapical horns. Distally, all three horns are parallel to each other ( Fig. 2l ). Distribution: Sundarbans 36 , Tamil Nadu coast, India 8 , 10 , Gulf of Mannar 9 , Bay of Bengal 6 , 13 , Great Nicobar Island, Andaman Sea 21 , Indian Ocean 11 , ROPME Sea Area, Iranian coastal waters 25 , Mediterranean waters 26 , Black Sea 27 , Vitória-Trindade Seamount Chain, South Atlantic Ocean 35 , Gulf of Mexico 15 , Mexican waters, Pacific Ocean 33 , Australian waters 31 , Caribbean Sea 32 . This species was widespread and recorded from the stations APK1, APK2, APK3 (surface and subsurface depths), and APK4 (subsurface depths) in Kakinada waters, from the state of Andhra Pradesh .