Virginia Land Snails
Total Page：16
File Type：pdf, Size：1020Kb
Home Pennsylvania Species Virginia Species Land Snail Ecology Resources Contact Virginia Land Snails Neohelix albolabris (Say, 1817) Family: Polygyridae Common name: Whitelip Identification Width: 25-31 mm Height: 16-19 mm tall Whorls: 5+ Neohelix albolabris is one of the largest and most familiar native Eastern land snails. The aperture of its large Photo(s): The large, globe-shaped snail shell has a reflected edge which extends underneath into a callus that covers the umbilicus. The shell is Neohelix albolabris by Bill Frank ©. covered with a sculpture of fine ridges and there are no denticles or “teeth” in the aperture. Click photo(s) to enlarge. Ecology This species hides in leaf litter or among rocks or logs in forests. It typically occurs at low densities, and is most often found in damp, rich habitats, often on lower forest slopes with coarse woody debris. It is especially fond of rotten sugar maple logs. In some cases it may be found in grassy areas such as roadsides (Hubricht, 1985). In a field study of N. albolabris distribution in an Ohio hardwood forest, this animal was found near larger rocks and was most active in periods of warmer temperatures and rainfall (Emberton, 1980). A field experiment in Michigan discovered that young N. albolabris had slower growth rates in the presence of adults, due to competition for food or water (Pearce, 1997). In a beech-hemlock stand in New York, Calosoma sp. beetles were a common predator of this snail (Ingram, 1950). Taxonomy Synonyms for N. albolabris include: Helix albolabris, H. rufa, Mesodon albolabris, M. a. var. dentate, Polygyra albolabris, P. a. goodrichi, P. a. var. minor, P. redii, and Triodopsis albolabris. Distribution The global range of Neohelix albolabris was generally considered to be from southern Canada, through Wisconsin to northern Mississippi, east to the high elevations of Georgia, and north to Maine. However, the recent discovery of cryptic “sister” species along the Atlantic Coast and to the south-west (as distinguished by mating anatomy and protein analysis; Emberton, 1988), suggests its range may be primarily the upper Midwest, north, northeast, and inland east. In Virginia it is apparently the whitelip snail of the state’s central-to-western counties. NatureServe Global Rank: G5 NatureServe State Rank: S5 Ken Hotopp, Meegan Winslow 8/2012 Range Map .