Gyraulus snail

Gyraulus is a genus of small, mostly air-breathing, freshwater snails, aquatic pulmonate gastropod molluscs in the family Planorbidae, the ram's horn snails. These are small snails with shells coiled in a flat spiral. The shells are usually pale or semi-transparent, although larger individuals may be covered in algae. There is no operculum (protective shield) covering the aperture (shell opening) when the animal withdraws. Like most snails they are grazers, scraping biofilms from submerged surfaces.
The snail shown was found in a small pond in a protected nature reserve. This specimen is not much larger than 1 mm. The image was taken with a stereo microscope equipped with a digital microscope camera.