Shell Architecture Up Close
In my opinion, molluscs are quite impressive looking things, and that is no less true of the smaller snails as it is octopi and giant clams. Vertigo pygmaea Draparnaud 1801 is a holarctic land snail often found in dry calcareous grassland and on dunes, but never in wooded areas. Inside the mouth of the shell are a number of folds known as ‘teeth’. which are very useful for identifying the species. V. pygmaea can have between four and seven of these teeth, but only one on the upper (‘parietal’) margin of the mouth.
Unfortunately I didn’t include a scale with this photo, but the background is my fingertip. V. pygmaea are seldom more than 2.3 mm high.