Mollusks : Carnegie Museum of Natural History

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Mollusks : Carnegie Museum of Natural History

Home Pennsylvania Species Virginia Species Land Snail Ecology Resources Contact Virginia Land Snails Polygyriscus virginianus (Burch, 1947) Family: Helicodiscidae Common name: Virginia Fringed Mountain Snail Identification Width: 1.9 – 4.2 mm Height: ≈1.3 mm Whorls: 4+ The small shell of Polygyriscus virginianus is flattened top and bottom, with rather deep whorls. The apex does not rise above the body whorl, and the umbilicus is only slightly impressed. The final part of the body whorl narrows and is deflected downward, becoming detached from the previous whorl. The aperture is slightly thickened, and contains a recessed transverse lamella. A second lamella is present on the upper palatal surface, receding into the opening. The shell is sculptured with a series of spiral “comb-like” deciduous fringes, typically lost from the lower surfaces but retaining 8-10 series above (Solem, 1975). The animal is pale, and presumably blind like others in its family. Ecology Shells of P. virginianus are found mainly on and near forested dolomitic bluffs along the New River in the Photo(s): Views of a Polygyriscis vicinity of Radford, Virginia. They are typically excavated from 10-30 cm of stony scree mixed with leaves and wood at the foot of slopes, below outcrops, or at the bases of trees; or beneath larger stones and talus. virginianus shell by Ken Hotopp ©. However, the handful of live animals that have been recovered have ranged from within 1 cm of the surface to 45 cm (Batie, 1987; Pearce & Hotopp, 2011). Click photo(s) to enlarge. Taxonomy A synonym for P. virginianus is Polygyra virginiana. Distribution This animal is reported only from Pulaski County, Virginia. NatureServe Global Rank: G1 NatureServe State Rank: S1 State Status: Endangered Virginia wildlife action plan: Tier I Federal Status: Endangered Ken Hotopp 1/2013 Range Map .

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Species of Greatest Conservation Need
APPENDIX A. VIRGINIA SPECIES OF GREATEST CONSERVATION NEED Taxa Common Scientific Name Tier Cons. Opp. Habitat Descriptive Habitat Notes Name Ranking Amphibians Barking Hyla gratiosa II a Forest Forests near or within The Virginia Fish and Wildlife Information System indicates treefrog shallow wetlands the loss suitable wetlands constitute the greatest threats to this species. DGIF recommends working to maintain or restore forested buffers surrounding occupied wetlands. These needs are consistent with action plan priorities to conserve and restore wetland habitats and associated buffers. Recently discovered populations within its known range, may indicate this species is more abundant than previously believed. An in-depth investigation into its status may warrant delisting. This species will be prioritized as Tier 2a. Amphibians Blue Ridge Desmognathus IV c Forest High elevation seeps, This species' distribution is very limited. Other than limiting dusky orestes streams, wet rock faces, logging activity in the occupied areas, no conservation salamander and riparian forests actions have been identified. Unless other threats or actions are identified, this species will be listed as Tier 4c. Amphibians Blue Ridge Eurycea III a Wetland Mountain streams and The needs of this species are consistent with priorities for two-lined wilderae adjacent riparian areas maintaining and enhancing riparian forests and aquatic salamander with mixed hardwood or habitats. This species will be listed as Tier 3a. spruce-fir forests up to 6000 feet. Amphibians Carpenter Lithobates III a Wetland Freshwater wetlands with The needs of this species are consistent with action plan frog virgatipes sphagnum moss priorities to preserve and restore aquatic and wetland habitats and water quality.
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