Switzerland’s drainage systems are divided into three major European river basins, i.e. the Po, the Rhône, and the Rhine basins. Until recently 32 species of freshwater mussel species (i.e. belonging to the genera Anodonta and Unio ) were recognized for the country, albeit their identity and number remain uncertain especially, given the recent recognition of Unio mancus Lamarck, 1819 from the Rhône in France, and Unio elongatu...