Nouvelle localité de Valvata cristata (O.F. Müller, 1774) (Gastropoda, Heterobranchia,Valvatidae) en Alsace (France, Bas-Rhin)

Valvata cristata is mostly documented in Alsace by data anterior to 1919. Only one recent locality, at Offendorg (Bas-Rhin) confirms the occurrence of this species in this area. In this paper, a new locality is added, a reed bed alimented by phreatic water near Eschau (Bas-Rhin) where two living specimens were collected in April 2011. Considering the current species distribution, I propose to include Valvata cristata under the category “rare” in the Red List of the molluscs from Alsace.