Abstract
The species composition, distribution, and morphological characters of heliozoans (Heliozoa) of fresh and marine biotopes of the European part of Russia have been studied using methods of light microscopy (LM) and scanning electron microscopy (SEM). A total of 23 species from 4 taxonomic groups have been found. Acanthocystis taurica, Polyplacocystis symmetrica, Pompholyxophris punicea, and Raphidiophrys ovalis have been found in Russia for the first time. Species Acanthocystis myriospina, Acanthocystis turfacea, and Raineriophrys fortesca have been characterized as euryhaline. The most species diversity of heliozoans has been found in sphagnum bogs. Illustrated descriptions of these species are presented.
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