Le genre Vertigo O.F. Müller, 1773 (Gastropoda, Stylommatophora, Vertiginidae) en Normandie, premier état des connaissances

According to the historical data on land molluscs in Normandy, three species belonging to the genus Vertigo were known in early XXth century: Vertigo pygmaea, V. antivertigo and V. moulinsiana. Nowadays, after five years of field surveys for a regional atlas project, three other species have been recorded: Vertigo angustior, V. pusilla and V. substriata; the former three are still present. V. pygmaea seems to be very common, occurring in a fairly wide variety of habitats, however V. antivertigo and V. substriata are restricted to damp environmental conditions but occur in scattered localities all over Normandy. V. pusilla, V. moulinsiana and V. angustior are rare and highly localised.