Home/Species/ Gray-foot Lancetooth Snail

Haplotrema concavum

(Say, 1821)

Gray-foot Lancetooth Snail

G5Secure Found in 4 roadless areas NatureServe Explorer →

G5SecureGlobal Rank

UnknownThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.108667

Element CodeIMGAS36040

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryInvertebrate Animal

Endemicoccurs (regularly, as a native taxon) in multiple nations

KingdomAnimalia

PhylumMollusca

ClassGastropoda

OrderStylommatophora

FamilyHaplotrematidae

GenusHaplotrema

Other Common Names

Gray-foot Lancetooth (EN) Grey-foot Lancetooth 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 Date2025-09-26

Change Date2002-10-08

Edition Date2025-09-26

Edition AuthorsCordeiro, J. (2009); rev. T. Cornelisse (2025)

Threat ImpactUnknown

Range Extent>2,500,000 square km (greater than 1,000,000 square miles)

Number of Occurrences> 300

Rank Reasons

This species has a large range, many occurrences, and populations appear to be relatively stable across its range.

Range Extent Comments

This species occurs in Ontario and Quebec, Canada and in the eastern United States from Wisconsin and Iowa to Maine, south to Florida and west to Texas (Lewis 2005; Waggoner et al. 2006; Dourson and Feeman 2006; Hotopp and Pearce 2007; NatureServe 2025; RARECAT 2025; InvertEBase 2025).

Occurrences Comments

This species is known from > 1200 occurrences using a 1 km separation distance and records from 1994-2025 (Lewis 2005; Waggoner et al. 2006; Dourson and Feeman 2006; Hotopp and Pearce 2007; NatureServe 2025; RARECAT 2025; InvertEBase 2025).

Threat Impact Comments

Threats to this species are unknown.

Ecology & Habitat

Diagnostic Characteristics

Haplotrema kendeighi is very difficult to differentiate from Haplotrema concavum. The live individual of H. kendeighi is blue whereas the live animal of H. concavum is gray. Also, H. concavum has a very wide umbilicus (Dourson 2013).

Habitat

This species is found in mixed hardwood forests at all elevations, but is less common low areas or floodplains (Dourson 2010, 2013).

Terrestrial Habitats

Forest/WoodlandForest - Hardwood

Other Nations (2)

United StatesN5

Province	Rank	Native
New Hampshire	SNR	Yes
Kentucky	S5	Yes
Texas	S1	Yes
Pennsylvania	S4	Yes
West Virginia	S5	Yes
Delaware	S1	Yes
Florida	SNR	Yes
Kansas	SNR	Yes
South Carolina	SNR	Yes
Michigan	SNR	Yes
Indiana	SNR	Yes
Mississippi	SNR	Yes
Virginia	S5	Yes
District of Columbia	SNR	Yes
New Jersey	SNR	Yes
Illinois	SNR	Yes
North Carolina	S5	Yes
New York	SNR	Yes
Ohio	SNR	Yes
Alabama	SNR	Yes
Massachusetts	SNR	Yes
Arkansas	SNR	Yes
Oklahoma	SNR	Yes
Georgia	SNR	Yes
Iowa	SNR	Yes
Louisiana	SNR	Yes
Tennessee	S5	Yes
Wisconsin	S3	Yes
Maine	SNR	Yes
Maryland	SNR	Yes
Missouri	SNR	Yes
Vermont	SNR	Yes

CanadaN3

Province	Rank	Native
Quebec	SNR	Yes
Ontario	S3	Yes

Threat Assessments

Threat	Scope	Severity	Timing
Unknown/undetermined	—	—	—

Roadless Areas (4)

Georgia (1)

Area	Forest	Acres
Rocky Mountain	Chattahoochee National Forest	4,269

North Carolina (1)

Area	Forest	Acres
Yellowhammer Branch (add.)	Nantahala National Forest	1,255

Tennessee (2)

Area	Forest	Acres
Devil's Backbone	Cherokee National Forest	4,287
Slide Hollow	Cherokee National Forest	4,057

References (17)

Burke, T.E. 2013. Land snails and slugs of the Pacific Northwest. Oregon State University Press, Corvallis. 352 pp
Dourson, D. and K. Feeman. 2006. A survey of terrestrial Mollusca in selected areas of the Land Between the Lakes National Recreation Area. Journal of the Kentucky Academy of Science, 67(1): 9-18.
Dourson, D.C. 2010. Kentucky's land snails and their ecological communities. Goatslug Publications, Bakersville, NC. 298 pp.
Dourson, D.C. 2013. Land snails of the Great Smoky Mountains National Park and southern Appalachians. Goatslug Publications, Bakersville, NC. 336 pp.
Dourson, D C. and West Virginia DNR. 2015. Land snails of West Virginia. Goatslug Publications, Bakersville, North Carolina. 412 pp.
Grimm, F.W. 1971. Annotated checklist of the land snails of Maryland and the District of Columbia. Sterkiana, 41: 51-57.
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.
Hubricht, L. 1985. The distribution of the native land mollusks of the eastern United States. Fieldiana: Zoology 24:1-191.
InvertEBase. 2025. Online. Available: https://invertebase.org/portal/index.php.
Lewis, J.J. 2005c. Bioinventory of Caves of the Cumberland Escarpment Area of Tennessee. Final Report to Tennessee Wildlife Resources Agency & The Nature Conservancy of Tennessee. Lewis & Associates LLC, 158 pp.
NatureServe. 2025. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
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.
Nylander, O.O. 1936. Land and Fresh Water Shells of Aroostook County, Maine. Unpublished Manuscript NYW-0010 at the O. Nylander Museum, Caribou, Maine.
<p>NatureServe's Rapid Analysis of Rarity and Endangerment Conservation Assessment Tool (RARECAT). 2025. Version: 2.1.1 (released April 04, 2025).</p>
Schroeder, L. 2008. The reluctant explorer. American Conchologist, 36(2): 32-34.
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.
Waggoner, J., S.A. Clark, K.E. Perez, and C. Lydeard. 2006. A survey of terrestrial gastropods of the Sipsey Wilderness (Bankead National Forest), Alabama. Southheastern Naturalist, 5(1): 57-68.

Haplotrema concavum

Diagnostic Characteristics

Habitat

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