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Home/Species/ Big-tooth Whitelip

Neohelix dentifera

(A. Binney, 1837)

Big-tooth Whitelip

G5Secure Found in 1 roadless area NatureServe Explorer →
G5SecureGlobal Rank
LowThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.111004
Element CodeIMGASA1100
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicoccurs (regularly, as a native taxon) in multiple nations
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderStylommatophora
FamilyPolygyridae
GenusNeohelix
Synonyms
Triodopsis dentifera(A. Binney, 1837)
Other Common Names
Big-tooth Whitelip Snail (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 (2024, 2025)
Threat ImpactLow
Range Extent200,000-2,500,000 square km (about 80,000-1,000,000 square miles)
Number of Occurrences81 - 300
Rank Reasons
Despite some regional threats, this species has a large range and number of occurrences, and it has been documented across its range consistently.
Range Extent Comments
This species occurs in Ontario and Quebec, Canada and in the eastern United States, from Kentucky and Ohio to Maine south to at least North Carolina along the Appalachian Mountains (Hotopp and Winslow 2012; NatureServe 2025; RARECAT 2025; InvertEBase 2025).
Occurrences Comments
This species is known from at least approximately 137 occurrences using a 1 km separation distance and records from 1994-2025 (Office of Kentucky Nature Preserves 2017; NatureServe 2025; RARECAT 2025; InvertEBase 2025).
Threat Impact Comments
This forest species is threatened by logging and mining, at least in part of its range (Office of Kentucky Nature Preserves 2017).
Ecology & Habitat

Habitat

This species is restricted to higher elevation mixed hardwood forests, found under leaf litter and around rocks and logs on acidic soils (Dourson 2013).
Terrestrial Habitats
Forest/WoodlandForest - Hardwood
Other Nations (2)
CanadaN1
ProvinceRankNative
QuebecSNRYes
OntarioS1Yes
United StatesN5
ProvinceRankNative
MassachusettsSNRYes
West VirginiaS5Yes
ConnecticutSNRYes
OhioSNRYes
New YorkSNRYes
New HampshireSNRYes
PennsylvaniaS4Yes
MarylandSNRYes
MaineSNRYes
North CarolinaS3Yes
KentuckyS2Yes
VermontSNRYes
VirginiaS3Yes
Threat Assessments
ThreatScopeSeverityTiming
3 - Energy production & miningSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)
3.2 - Mining & quarryingSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)
5 - Biological resource useSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)
5.3 - Logging & wood harvestingSmall (1-10%)Serious or 31-70% pop. declineHigh (continuing)

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Roadless Areas (1)
West Virginia (1)
AreaForestAcres
Cheat MountainMonongahela National Forest8,191
References (15)
  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. Global Biodiversity Information Facility (GBIF). 2024. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2024).
  7. 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.
  8. InvertEBase. 2024. Online. Available: https://invertebase.org/portal/index.php.
  9. InvertEBase. 2025. Online. Available: https://invertebase.org/portal/index.php.
  10. NatureServe. 2025. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  11. Nekola, J.C. 2008. Land snail ecology and biogeography of eastern Maine. Final report submitted to: Maine Department of Inland Fisheries & Wildlife and the Aroostook Hills and Lowlands Inventory, January 27, 2008. 119 pp.
  12. Nylander, O.O. 1936. Land and Fresh Water Shells of Aroostook County, Maine. Unpublished Manuscript NYW-0010 at the O. Nylander Museum, Caribou, Maine.
  13. Office of Kentucky Nature Preserves. 2017. Element Subnational Ranking Form in Biotics 5 database. NatureServe, Arlington, Virginia.
  14. <p>NatureServe's Rapid Analysis of Rarity and Endangerment Conservation Assessment Tool (RARECAT). 2025. Version: 2.1.1 (released April 04, 2025).</p>
  15. 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.