Observations on Centroheliozoa of the Volga basin (Protozoa: Sarcodina)

K.A. Mikrjukov

Abstract. An examination of the Centroheliozoa fauna of the Volga basin is performed. The work was conducted in the Moscow, Yaroslavl, Samara and Astrakhan provinces. Thirteen species of Centroheliozoa were found and illustrated by scanning electron microscopy. Among them 8 species are usual for central Europe; Choanocystis rotundata is recorded in Europe for the first time. Two new species are described: Acanthocystis astrakhanensis (from the Volga outfall) and Pterocystis schulmani (from the Kuibyshev reservior). An emended diagnosis for Raphidocystis lemani is proposed.

Zoosystematica Rossica, 1993, 2(2): 201–209 ▪ Published in print 31 December 1993

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