Results of long-term original researches and the literary data of a species biodiversity of the genus Dinophysis of the Ukrainian coast of Black Sea are generalized. It is established that this genus is represented by 25 species. Species composition of Dinophysis at coast of Crimea is more diverse with 21 species, but in the northwestern Black Sea there are 17 species. Three dominated species Dinophysis acuminata, D. caudata and D. rotundata which are most common for the northwestern Black Sea. Species of the genus were presented in the plankton from May to November at temperature of water surface 7.5–26.6 °C and salinity 9.7–17.6 ‰. The maximum abundance of species is noted in August, minimum in November. Seasonal changes of a complex of species of the given genus, and also feature of their spatial distribution in the Odessa Bay and adjoining water area are described. The obtained data testifies to necessity of the permanent hydrobiological control of the development of potentially toxic microalgae of genus Dinophysis which are indicators of high organic pollution of the water environment.

Keywords: Dinophysis, potentially toxic species, Odessa Bay, Black Sea, the Crimean coast, northwestern Black Sea, seasonal dynamics, station of biological clearing "Yuzhnaya"

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