Pomatiopsis - Walker Snails (Family Pomatiopsidae)
Walker snails are amphibious snails, more often listed with aquatic species than with terrestrial. They are prosobranch snails, a large group of primarily aquatic snails, with a gill for breathing and a cover over the aperture called an operculum. Regardless of their affinity to truely aquatic snails, they may be found a short distance from water.
Oesch et al. (2013) note that the Slender Walker “lives in the water or on land, in wet to moist environments such as stream banks, fens, and lowlands.” The size range of these taller-than-wide conical snails is 5-7 mm and they are superficially similar to some Pupillids. The lip is slightly reflected according to Dourson (2010).