Clausilia parvula(Ferrussac,1807)
Shell:reddish brown or purplish,8-10.5 high x 2.0-2.5 mm wide.
Habitat:woods,rocky slopes,old walls
Area:Central-Europe
Clausilia bidentata(Ström,1765)Door Snail
Shell:dark reddish brown or blackish,9-12 high x 2.3-2.7 mm wide.
Habitat:between rocks,old walls,woods,shrubs
Area:West-Europe
Clausilia dubia(Draparnaud,1805)
Shell:dark reddish brown or blackish,11-14 high x 2.7-3.2 mm wide,10-11,5 whorls.
There are a lot of sub-species.
Habitat:damp shady rocks,old walls,up to 2400 mtrs in Switzerland
Area:Central-Europe and in the North of England
