Approche biochimique et morphologique des espèces du genre Trichia (Helicidae, Gastropoda) de Suisse occidentale

The highly polymorphic so called "Trichia hispida group" is taxonomically problematic. According to different authors, one to about one hundred species are recognized in this group. Some recent publications admit 8 species for Central Euorpe. The present study gives arguments from biochemical data (12 enzymatic loci are electrophoretically analysed) for regrouping 5 morphological types into 2 species : Trichia sericea (Müller) var. sericea, plebeia, montana and striolata, and T.hispida(L.). A multivariate analysis of morphological measurments, and patterns of coexistence seem to corroborate this interpretation. T. sericea presents a wider ecological and morphological range, and both species need further investigations on their ecological and taxonomical relationship.