MORPHOLOGICAL VARIABILITY AND DISTRIBUTION OF THE RARE SPECIES EUNOTIA ZYGODON (BACILLARIOPHYTA) IN THE RUSSIAN FAR EAST
Lubov A. Medvedeva1
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the RAS, Vladivostok, Russia
Keywords: Eunotia zygodon, diatoms, area, Far East, Russia
Abstract
Previously, the species Eunotia zygodon Ehrenberg was known in Russia only from the Vladimir Region (near Murom). For the first time in the Russian Far East, the species was found in the reservoirs of the Bastak Nature Reserve in the Jewish Autonomous Region. Later, the species and its variety var. elongata Hustedt ex Simonsen were also indicated for other reservoirs of this reserve, as well as for neighboring areas: Khabarovsk Krai and Amur Region. Based on the original data and literary information, a diagnosis of the species was made, the variability of its valve shape was shown, and its full area was identified. The species is most widely distributed in the countries of the southern hemisphere. With analyzing the original data and comparing it with materials from tropical Africa, we came to the conclusion that the previously indicated variety E. zygodon var. elongata should be attributed to the typical form. Thus, indicating this variety for the territory of the southern Far East should be considered erroneous.
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