Diagnosis and description of Gymnodinium feofanium Krachm. sp. nov. from the pond in Feofania Park (Kiev, Ukraine) are given, this species was found in April 2014. Cells 18.0–29.0 µm long and 15.72–34.08 µm wide, globose, slightly compressed dorso-ventrally. Epicone hemispherical, slightly asymmetrical. Hypocone reverse trapezoidal, cup-shaped. In the area of sulcus there is a protrusion of epicone, its length comprises two widths of the cingulum. Cingulum equatorial, descending, displaced 0.5–1.0 cingulum widths. Sulcus wide, V-shaped, located only on hypocone, reaches antapex. Chloroplasts numerous, fulvous, located at the periphery of the cell. Nucleus large, usually located in the center. Stigma red colored. Small vacuoles are present in the cytoplasm.

Keywords: Dinophyta, Dinoflagellata, Gymnodinium feofanium Krachmalny sp. nov., Ukraine

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