Fourteen species of the family Lymnaeidae were revealed in the samples taken from lowland and mountainous parts of the Ukrainian Transcarpathian. Five species are regionally new: Stagnicola corvus, Radix parapsilia, R. balthica, R. ampla and R. tumida; two regionally rare species (Ladislavella terebra and Lymnaea fragilis) are discovered. The most widespread pond snails appear to be Lymnaea stagnalis and Radix intermedia, the rarest one – L. terebra and R. parapsilia found in single locality each. The lowland part of the Ukrainian Transcarpathian maintains more than 4/5 regional fauna of the Lymnaeidae, though a few species occurred in the mountainous locations collected above the 400 m a.s.l. The check-list of species, with appropriate comments on taxonomy, distribution and some ecological characteristics of the lymnaeids found within the studied area is provided. A list of species of aquatic snails and bivalves co-occurring with the Lymnaeidae in the studied area is provided. Relatively high species diversity of malacofauna in the region combined with rarity of some species allow to consider the Transcarpathian as a specific region apparently representing a separate biogeographic unit. There is a need for a further estimate of the regionally rare species in order to clarify their potential conservation status.
Morphological Traits of the Radula in Viviparidae (Mollusca, Caenogastropoda) as a Master Key to Discrimination of Closely Related Species. Anistratenko V. V., Ryabceva Yu. S., Degtyarenko E. V. -The radula morphology and variability in four European species of the family Viviparidae viz. Viviparus viviparus (Linnaeus, 1758), V. sphaeridius (Bourguignat, 1880), V. ater (Cristofori et Jan, 1832) and Contectiana listeri (Forbes et Hanley, 1853) were examined using scanning electron microscopy (SEM). Statistical methods reveal a certain value of rachidian tooth dimensional parameters as an efficient tool for taxonomy and discrimination of closely related species of the family. K e y w o r d s:
One species is new for the regional fauna (Sphaerium nucleus), another three are rare and their range is strictly limited to a few localities (Musculium lacustre, Bythinella sp. and Terrestribythinella baidashnikovi). It is discovered one additional locality of alien species Sinanodonta woodiana recently introduced into the Transcarpathian. Images of the shells, comments on taxonomy, distribution and ecology of these species are provided.
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