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Morphology and Species Composition of Centrohelid Heliozoans (Centroplasthelida) from the Continental Lowland River with Salinity Gradient

  • BIOLOGY, MORPHOLOGY AND SYSTEMATICS OF HYDROBIONTS
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Abstract

This paper expands the previous research devoted to species composition and morphology of centrohelid heliozoans in continental saline and brackish waters of Russia. Thirteen centrohelid heliozoans and one form of Heterophrys-like organism (HLO) from the continental Tuzlukkol’ River with salinity gradient (0.6–22 ppt) were described using scanning electron microscopy. Six species, Pterocystis foliacea, Raineriophrys raineri, Choanocystis perpusilla, Choanocystis aff. pelagica, Acanthocystis nichollsi, A. turfacea, and one HLO were revealed in the Tuzlukkol’ River for the first time. The other seven species, Raineriophrys erinaceoides, A. astrakhanensis, A. dentata, A. myriospina, A. pectinata, and A. taurica, have been re-detected in sampling sites with lower or higher salinity levels. The species Choanocystis aff. pelagica and A. nichollsi were revealed in continental brackish waters of Russia for the first time. The species list of centrohelids in brackish waters worldwide includes 29 species, and in Russia—20 species, including three species, Raineriophrys raineri, Choanocystis aff. pelagica, and A. nichollsi, which are new for continental brackish waters of Russia. The question of poorly-studied continental brackish-water centrohelids is discussed.

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Funding

This research was funded by the Tyumen oblast Government, as part of the West-Siberian Interregional Science and Education Center’s project no. 89-DON (2).

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  1. Institute for Cellular and Intracellular Symbiosis, Ural Branch, Russian Academy of Sciences, Orenburg, Russia

    E. A. Gerasimova

  2. AquaBioSafe Laboratory, University of Tyumen, Tyumen, Russia

    E. A. Gerasimova

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Correspondence to E. A. Gerasimova.

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The English language check and manuscript proofreading was carried out by Effective Language Tutoring Services (http://effect19.tmweb.ru/).

The text was submitted by the author in English.

Abbreviations: HLO—Heterophrys-like organism.

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Gerasimova, E.A. Morphology and Species Composition of Centrohelid Heliozoans (Centroplasthelida) from the Continental Lowland River with Salinity Gradient. Inland Water Biol 14, 652–661 (2021). https://doi.org/10.1134/S1995082921060043

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