The article reports the finding of a population of freshwater snails morphologically and genetically identified as Ladislavella cf. terebra (Westerlund, 1885), in a reservoir situated in Penza City. This is the first reliable record of representatives of the genus Ladislavella on the territory of European Russia, at a considerable distance from the previously known boundaries of its range. Molecular data suggest that the examined population belongs to the previously unknown species of Ladislavella. The morphoanatomic and ecological characteristics of the studied population and some information about parasites and commensals of mollusсs are given.
The variability of conchiological characters of the shell of the terrestrial mollusk Chondrula tridens (Müller 1774) from 4 different types of landscapes of the Ulyanovsk region was studied. Analysis of elementary characters, proportions and wellhead armament of shell structures demonstrates a significant heterogeneity of the species. The large size of the shell of the snails is explained by an increase in the growth period due to an increase in temperature and humidity in the conditions of the north-western and southern landscapes of the Ulyanovsk region, as well as in the urbanized environment. Reducing the height of the shell, increasing roundness and better development of the mouth teeth of mollusks living in the chalk steppe reflects their adaptability to the conditions of more xerothermic landscapes, and also determines the position of the shell in space.
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