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We present the results of a terrestrial mollusc inventory in the Cybina River Valley (W. Poland). The species richness in 39 sites served as a biodiversity criterion for the whole area. The total number of 3,193 specimens collected represented 51 species (22 families), i.e. about 60% of terrestrial snail species of the whole Wielkopolska region. Species regarded as rare in the region and in the whole country constituted 22% of the whole material. Two of them are especially noteworthy: Vertigo angustior Jeffreys (Annex II, EU Habitats Directive), and Ruthenica filograna (Rossmassler) which is very rare in the region.

Biodiversity of terrestrial malacocoenoses as a criterion in assessment of conservation status - the Cybina Valley, a proposed Natura 2000 area