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Home/Species/ Velvet Wedge Snail

Xolotrema denotatum

(Ferussac, 1821)

Velvet Wedge Snail

G4Apparently Secure Found in 2 roadless areas NatureServe Explorer →
G4Apparently SecureGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.112470
Element CodeIMGASA1110
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderStylommatophora
FamilyPolygyridae
GenusXolotrema
Synonyms
Triodopsis denotata(Ferussac, 1821)Xolotrema denotataFerussac, 1821
Other Common Names
Velvet Wedge (EN)
Concept Reference
Turgeon, D. D., J. F. Quinn, Jr., A. E. Bogan, E. V. Coan, F. G. Hochberg, W. G. Lyons, P. M. Mikkelsen, R. J. Neves, C. F. E. Roper, G. Rosenberg, B. Roth, A. Scheltema, F. G. Thompson, M. Vecchione, and J. D. Williams. 1998. Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks. 2nd Edition. American Fisheries Society Special Publication 26, Bethesda, Maryland. 526 pp.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2025-09-16
Change Date2025-09-16
Edition Date2025-09-16
Edition AuthorsCordeiro, J. (2009); rev. T. Cornelisse (2025)
Threat ImpactUnknown
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences81 - 300
Rank Reasons
This species has a large range, many occurrences, and populations appear stable, but threats are unknown.
Range Extent Comments
This species occurs in Quebec and Ontario, Canada and in the eastern United States from Michigan to Vermont, south to North Carolina and west to Arkansas (Hotopp and Pearce 2007; NatureServe 2025; RARECAT 2025; InvertEBase 2025).
Occurrences Comments
This species is known from at least approximately 252 occurrences using a 1 km separation distance and records from 1994-2025 (Hotopp and Pearce 2007; NatureServe 2025; RARECAT 2025; InvertEBase 2025).
Threat Impact Comments
Threats to this species are unknown.
Ecology & Habitat

Habitat

This species is often associated with rotting hardwood trees in advanced stages of decay in a variety of upland mixed hardwood sites (Dourson 2013).
Terrestrial Habitats
Forest - HardwoodWoodland - HardwoodBare rock/talus/scree
Other Nations (2)
United StatesN4
ProvinceRankNative
AlabamaSNRYes
New JerseySNRYes
KentuckyS4Yes
VirginiaS3Yes
ArkansasSNRYes
West VirginiaSNRYes
IndianaSNRYes
PennsylvaniaS4Yes
North CarolinaSUYes
MississippiSNRYes
New YorkSNRYes
TennesseeS5Yes
MassachusettsSNRYes
MichiganSHYes
VermontSNRYes
MarylandSNRYes
OhioSNRYes
CanadaN2
ProvinceRankNative
OntarioS2Yes
QuebecSNRYes
Threat Assessments
ThreatScopeSeverityTiming
Unknown/undetermined———

—

Roadless Areas (2)
Tennessee (1)
AreaForestAcres
Rogers RidgeCherokee National Forest4,738
Virginia (1)
AreaForestAcres
Rogers RunJefferson National Forest181
References (11)
  1. Burke, T.E. 2013. Land snails and slugs of the Pacific Northwest. Oregon State University Press, Corvallis. 352 pp
  2. Dourson, D.C. 2010. Kentucky's land snails and their ecological communities. Goatslug Publications, Bakersville, NC. 298 pp.
  3. Dourson, D.C. 2013. Land snails of the Great Smoky Mountains National Park and southern Appalachians. Goatslug Publications, Bakersville, NC. 336 pp.
  4. Dourson, D C. and West Virginia DNR. 2015. Land snails of West Virginia. Goatslug Publications, Bakersville, North Carolina. 412 pp.
  5. Emberton, K.C. 1988. The genitalic, allozymic, and conchological evolution of the eastern North American Triodopsinae (Gastropoda: Pulmonata: Polygyridae). Malacologia, 28(1-2): 159-273.
  6. Hotopp, K. and T.A. Pearce. 2007. Land snails in New York: statewide distribution and talus site faunas. Final Report for contract #NYHER 041129 submitted to New York State Biodiversity Research Institute, New York State Museum, Albany, New York. 91 pp.
  7. Hubricht, L. 1953. Land snails of the southern Atlantic Coastal Plain. The Nautilus, 66(4): 114-125.
  8. InvertEBase. 2025. Online. Available: https://invertebase.org/portal/index.php.
  9. NatureServe. 2025. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  10. <p>NatureServe's Rapid Analysis of Rarity and Endangerment Conservation Assessment Tool (RARECAT). 2025. Version: 2.1.1 (released April 04, 2025).</p>
  11. Turgeon, D. D., J. F. Quinn, Jr., A. E. Bogan, E. V. Coan, F. G. Hochberg, W. G. Lyons, P. M. Mikkelsen, R. J. Neves, C. F. E. Roper, G. Rosenberg, B. Roth, A. Scheltema, F. G. Thompson, M. Vecchione, and J. D. Williams. 1998. Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks. 2nd Edition. American Fisheries Society Special Publication 26, Bethesda, Maryland. 526 pp.