About Perpolita hammonis (Strøm, 1765)
Perpolita hammonis (also referenced as Nesiovitrea hammonis and previously as N. hammonis) has a light, usually reddish brown, shiny shell that measures 1.9-2.1 mm by 3.6-4.1 mm (0.075-0.083 inches by 0.142-0.161 inches). The shell holds between 3 and 3.5 whorls, and features characteristic regular radial lines in the form of riblets, with 9-14 riblets per millimeter (7-11 riblets per 1/32 inch). These radial lines can be used to distinguish young Perpolita hammonis from young snails of the Oxychilidae and Gastrodontidae families. The umbilicus is open, not deep, and slightly off-center on the last whorl. In fresh shells, very faint spiral lines are visible under high magnification; there are roughly 10 spiral lines per radial riblet, totaling 100-150 lines per millimeter (80-120 lines per 1/32 inch). The soft body of the snail is slender and blackish. Its tentacles are black, the foot is narrow and grey with blackish upper edges and black spots along the sides, and the mantle is light grey. This species has been recorded in multiple countries and islands, including the Czech Republic, Ukraine, Great Britain, Ireland, and Malaysia, as well as other unlisted regions. It can live in a wide variety of habitats ranging from dry to humid conditions, and tolerates acidic soils. While it can survive in open sites such as meadows, it generally inhabits wooded areas and is commonly found in beech forests.
