Home/Species/ Columbia Oregonian

Cryptomastix hendersoni

(Pilsbry, 1928)

Columbia Oregonian

G3Vulnerable (G3Q) Found in 1 roadless area NatureServe Explorer →

G3VulnerableGlobal Rank

HighThreat Impact

Identity

Unique IDELEMENT_GLOBAL.2.110026

Element CodeIMGAS93030

Record TypeSPECIES

ClassificationSpecies

Classification StatusStandard

Name CategoryInvertebrate Animal

Endemicendemic to a single nation

KingdomAnimalia

PhylumMollusca

ClassGastropoda

OrderStylommatophora

FamilyPolygyridae

GenusCryptomastix

Other Common Names

Columbia Oregonian landsnail (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 MethodLegacy Rank calculation - Biotics v1

Review Date2019-12-03

Change Date2019-12-03

Edition Date2019-12-02

Edition AuthorsEleanor Gaines

Threat ImpactHigh

Range Extent20,000-200,000 square km (about 8000-80,000 square miles)

Number of Occurrences21 - 80

Rank Reasons

This species has a fragmented distribution in its small range and faces serious threats. Few individuals are found at most sites.

Range Extent Comments

This species is known from the Columbia River Gorge in Oregon and Washington, east to the Hells Canyon area in east-central Idaho, and north along the Yakima River in Washington (Burke 2013). Specimens from the Columbia River in Chelan Co Washington appear to fit the description of Cryptomastix hendersoni, but require further examination and are not included in the range extent (Burke 2013, Foltz-Jordan and Black 2015). Likewise, this range extent does not include specimens from Mt Hood National Forest in Oregon, which Burke believes are different taxon (Foltz-Jordan and Black 2015). Because of this uncertainty, the estimate of range extent is approximate. The type locality is The Dalles, Oregon.

Occurrences Comments

Approximately 22 occurrences within the range recognized by Burke (2013).

Threat Impact Comments

Most populations are from the Columbia River Gorge, where the species faces habitat loss from development, increasing fire frequency and intensity, and changing water regimes.

Ecology & Habitat

Habitat

Cryptomastix hendersoni is a riparian associate found under rocks and herbaceous vegetation at the margins of seeps and spring-fed streams, typically along sun lit margins of streams in open rocky areas with few trees (Frest and Johannes 1995, Foltz Jordan and Black 2015). Sometimes found at the base of talus with persistent moisture in otherwise dry terrain (Frest and Johannes 1995).

Other Nations (1)

United StatesN1

Province	Rank	Native
Washington	S1	Yes
Idaho	S3	Yes
Oregon	S2	Yes

Threat Assessments

Threat	Scope	Severity	Timing
1 - Residential & commercial development	Small (1-10%)	Slight or 1-10% pop. decline	—
1.1 - Housing & urban areas	Small (1-10%)	Slight or 1-10% pop. decline	—
1.2 - Commercial & industrial areas	Small (1-10%)	Slight or 1-10% pop. decline	—
2 - Agriculture & aquaculture	Restricted (11-30%)	Serious or 31-70% pop. decline	—
2.3 - Livestock farming & ranching	Restricted (11-30%)	Serious or 31-70% pop. decline	—
4 - Transportation & service corridors	Large (31-70%)	Serious - moderate	—
4.1 - Roads & railroads	Large (31-70%)	Serious - moderate	—
6 - Human intrusions & disturbance	Small (1-10%)	Slight or 1-10% pop. decline	—
6.1 - Recreational activities	Small (1-10%)	Slight or 1-10% pop. decline	—
7 - Natural system modifications	Restricted (11-30%)	Moderate or 11-30% pop. decline	—
7.1 - Fire & fire suppression	Small (1-10%)	Slight or 1-10% pop. decline	—
7.2 - Dams & water management/use	Restricted (11-30%)	Moderate or 11-30% pop. decline	—
7.2.3 - Abstraction of surface water (agricultural use)	Restricted (11-30%)	Moderate or 11-30% pop. decline	—

Roadless Areas (1)

Oregon (1)

Area	Forest	Acres
Lookingglass	Umatilla National Forest	4,859

References (8)

Burke, T.E. 2013. Land snails and slugs of the Pacific Northwest. Oregon State University Press, Corvallis. 352 pp
Foltz Jordan, S and S. Hoffman Black. 2012. Effects of forest land management on terrestrial mollusks: A literature review. Report from Xerces Society to Interagency Special Status and Sensitive Specvies Program, USDA Forest Service, Region 6 and USDI Oregon/Washington Bureau of Land Management. 87 pp. Unpublished. Downloaded from http://www.xerces.org/wp-content/uploads/2012/04/forest-land-management-and-mollusks.pdf on 16 November 2017.
Folz Jordan, S. and S. H. Black. 2015. Conservation Assessment for Cryptomastix hendersoni, Columbia oregonian. USDA Forest Service Region 6 and USDI Bureau of Land Management, Oregon and Washington Interagency Special Status and Sensitive Species Program. 23 pp.
Frest, T.J. and E.J. Johannes. 1995c. Interior Columbia Basin mollusk species of special concern. Final Report (contract #43-0E00-4-9112) prepared for Interior Columbia Basin Ecosystem Management Project. Deixis Consultants, Seattle, Washington. 274 pp. + tabs., figs.
Gaines, E. Zoology Data Manager, Oregon Natural Heritage Program, Oregon Field Office, Portland, Oregon. Pers. comm.
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.
U.S. Fish and Wildlife Service (USFWS). 2011. Endangered and Threatened Wildlife and Plants; 90-Day Finding on a Petition to List 29 Mollusk Species as Threatened or Endangered with Critical Habitat; Proposed Rule. Federal Register 76(193):61826-61853.
U.S. Fish and Wildlife Service (USFWS). 2022. Endangered and Threatened Wildlife and Plants; One Species Not Warranted for Delisting and Seven Species Not Warranted for Listing as Endangered or Threatened Species. Federal Register 87(249):80080-80088.

Cryptomastix hendersoni

Habitat

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