Roadless Areas
Home/Species/ Hooded Lancetooth

Ancotrema voyanum

(Newcomb, 1865)

Hooded Lancetooth

G1Critically Imperiled (G1G2) Found in 3 roadless areas NatureServe Explorer →
G1Critically ImperiledGlobal Rank
Very high - highThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.116102
Element CodeIMGAS36130
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicendemic to a single nation
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderStylommatophora
FamilyHaplotrematidae
GenusAncotrema
Synonyms
Haplotrema voyanum
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 Date2020-01-04
Change Date2005-07-11
Edition Date2020-01-04
Edition AuthorsMisty Nelson
Threat ImpactVery high - high
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences6 - 20
Rank Reasons
Little is known about the life history, population size, or trends. Isolated populations within limited range, although most known occurrences are located on protected lands.
Range Extent Comments
This species occurs in northern California, USA, including Humboldt, Siskiyou, Trinity, and Shasta Counties for the various subspecies (Roth and Sadeghian, 2003). The range extent is approximately 2,476 sq km, based on 18 California Natural Diversity Database occurrences.
Occurrences Comments
There are 18 California Natural Diversity Database occurrences.
Threat Impact Comments
Primary threats are habitat degradation due to livestock grazing, as well as climate change related increases in fire activity/severity and drought conditions.
Ecology & Habitat

Habitat

This species is found in areas of damp forest in either upland or riparian habitat with moisture-rich soil. Leaf litter and woody debris are important (Duncan, 2003).
Palustrine Habitats
FORESTED WETLANDRiparian
Other Nations (1)
United StatesN1
ProvinceRankNative
CaliforniaS1Yes
OregonSNRYes
Threat Assessments
ThreatScopeSeverityTiming
2 - Agriculture & aquacultureLarge (31-70%)Serious - moderateHigh (continuing)
2.3 - Livestock farming & ranchingLarge (31-70%)Serious - moderateHigh (continuing)
3 - Energy production & miningUnknownUnknown—
3.2 - Mining & quarryingUnknownUnknown—
5 - Biological resource useUnknownUnknown—
5.3 - Logging & wood harvestingUnknownUnknown—
7 - Natural system modificationsPervasive - largeSerious - moderateHigh (continuing)
7.1 - Fire & fire suppressionPervasive - largeSerious - moderateHigh (continuing)
11 - Climate change & severe weatherLarge (31-70%)Serious - moderateHigh (continuing)
11.2 - DroughtsLarge (31-70%)Serious - moderateHigh (continuing)

—

Roadless Areas (3)
California (3)
AreaForestAcres
Orleans Mtn. BSix Rivers National Forest17,183
PantherShasta-Trinity National Forest12,016
PattisonShasta-Trinity National Forest29,299
References (6)
  1. Burke, T.E., J.S. Applegarth, and T.R. Weasma. 1999. Management recommendations for survey and manage terrestrial mollusks. Ver. 2.0. Report submitted to USDI Bureau of Land Management, Salem, Oregon, October 1999. Unpaginated.
  2. Dunk, J.R., W.J. Zielinski, and H.K. Preisler. 2004. Predicting the occurrence of rare mollusks in northern California forests. Ecological Applications, 14(3): 713-729.
  3. Frest, T.J., and E.J. Johannes. 1993. Mollusc Species of Special Concern within the Range of the Northern Spotted Owl. Deixis Consultants, Final Report. Unpublished report prepared for the Forest Ecosystem Management Working Group, U.S.D.A. Forest Service; Pacific Northwest Region; Portland, OR. 98 pp.
  4. Frest, T.J. and E.J. Johannes. 2000b. A baseline mollusk survey of southwestern Oregon, with emphasis on the Rogue and Umpqua River drainages. Report for the Oregon Natural Heritage Program, Portland, Oregon. Deixis Consultants, Seattle, Washington. 403 pp.
  5. Kelley, R., S. Dowlan, N. Duncan, and T. Burke. 1999. Field guide to survey and manage terrestrial mollusk species from the northwest forest plan. Unpublished report of the Bureau of Land Management, Oregon State Office. 114 pp.
  6. 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.