Desmoulin’s Whorl Snail Vertigo moulinsiana
Desmoulin’s whorl snail Vertigo moulinsiana is the largest Vertigo species, with a shell height up to about 2.6 mm. It is restricted to calcareous wetlands, usually bordering lakes or rivers, or in fens. High humidity appears to be important in determining local distribution within sites. It normally lives on reed-grasses and sedges. Image: Gilles San Martin (Flickr).