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.