New chrysophycean stomatocysts (Chrysophyceae) for Russia from the Omsk Priirtyshye waterbodies

Eight new morphotypes of chrysophycean stomatocysts for Russia were recorded from the plankton of the Omsk Priirtyshye waterbodies. Their descriptions based on the electron microscopical observations as well as original illustrations are given. The differences of the observed specimens from the type ones are discussed. It was shown that presence/absence of lacunae and their diameter are rather variable features.