Authors: Conchiometrical variability of Batavusiana crassa (Bivalvia, Unionidae) in the funds of State Natural Historical Museum
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220 valves of B. crassa collected from the end of XIX century to the beginning of XXI century on the territories of Vinnitsa, Volyn, Zhitomir, Ivano-Frankinsk, Lviv, Ternopil, Chernigiv Regions and Crimea were measured. The dependence of the mussel sizes and their indexes from the age of the mollusks and the time of the collecting (end of XIX century – beginning of XX century, middle of XX century, beginning of XXI century) was analyzed. The deceleration of the growth caused with the aggravation of the quality of the water environment during the XX century was a failure to reveal. On the base of the one’s own researches and the literature data the variability of the indexes characterizing the form of the mussels was analyzed in the main river basins on the territory of Ukraine.