Morphology of Peridiniopsis elpatiewskyi theca was investigated on specimens from the population revealing in June 2003 in the pond in vicinities of Kiev. First data on microstructure of apical porous complex are presented; more specific information was obtained concerning the number of girdle plates. Paper is illustrated by microphotographs making on SEM.

Keywords: Peridiniopsis elpatiewskyi, Dinophyta, morphology, theca, phytoplankton, Ukraine

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