Roadless Areas
Home/Species/ Oregon Megomphix

Megomphix hemphilli

(W.G. Binney, 1879)

Oregon Megomphix

G3Vulnerable Found in 1 roadless area NatureServe Explorer →
G3VulnerableGlobal Rank
Identity
Unique IDELEMENT_GLOBAL.2.120806
Element CodeIMGASB2020
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicendemic to a single nation
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderStylommatophora
FamilyMegomphicidae
GenusMegomphix
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
Review Date2008-05-13
Change Date2006-04-11
Edition Date2008-05-13
Edition AuthorsCordeiro, J. (2008); Steiner, M. (1996)
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences6 - 20
Rank Reasons
For Washington, records indicate this species has a low-elevation distribution from Olympia to the Columbia River that does not include any National Forest. For Oregon, it is known from the Coos Bay, Eugene, Roseburg, and Salem Districts and is suspected to occur in the Medford District of the Bureau of Land Management. It is known from the Siuslaw, Umpqua and Willamette National Forests and is suspected to occur in the Mount Hood, Rogue River, and Siskiyou National Forests, and the Columbia River Gorge National Scenic Area.
Range Extent Comments
For Washington, records indicate this species has a low-elevation distribution from Olympia to the Columbia River that does not include any National Forest. For Oregon, it is known from the Coos Bay, Eugene, Roseburg, and Salem Districts and is suspected to occur in the Medford District of the Bureau of Land Management. It is known from the Siuslaw, Umpqua and Willamette National Forests and is suspected to occur in the Mount Hood, Rogue River, and Siskiyou National Forests, and the Columbia River Gorge National Scenic Area. Specimens collected by Branson (1977; 1980) on the Olympic Peninsula have been determined to be immature haplotrematid snails (Applegarth, 2000).
Occurrences Comments
For Washington, there are 12 records based on 45 specimens; records indicate this species has a low-elevation (below 150 m) distribution from Olympia to the Columbia River that does not include any National Forest. For Oregon, it is known from over 850 known (most lumped into single populations) the Coos Bay, Eugene, Roseburg, and Salem Districts and is suspected to occur in the Medford District of the Bureau of Land Management. It is known from the Siuslaw, Umpqua and Willamette National Forests and is suspected to occur in the Mount Hood, Rogue River, and Siskiyou National Forests, and the Columbia River Gorge National Scenic Area at elevations 150-450 m in the following counties: Clackamas, Clatsop, Coos, Douglas, Linn, Multnomah, and Tillamook (Applegarth, 2000).
Threat Impact Comments
Primary threats are isolating or losing additional populations, further loss of habitat to support the species across the landscape (especially bigleaf maples, associated leaf litter and coarse woody debris), predation, competition from exotic mollusks, high intensity fire, and inappropriate use of chemicals.
Ecology & Habitat

Habitat

The species occurs at low to moderate elevations, below the zone of seasonally persistent snow pack. It is found within and under the mat of decaying leaves under bigleaf maples, hazel bushes and sword ferns. They have also been found in leaf mold containing a mix of conifer and bigleaf maple debris, and occasionally under pieces of fallen bark (Applegarth, 2000).
Terrestrial Habitats
Forest - Mixed
Other Nations (1)
United StatesN3
ProvinceRankNative
OregonS3Yes
WashingtonS1Yes
Roadless Areas (1)
Oregon (1)
AreaForestAcres
Roaring RiverMt. Hood National Forest27,316
References (8)
  1. Applegarth, John S. Biologist. Bureau of Land Management, Eugene District. Eugene, Oregon
  2. Applegarth, J.S. 2000. Management recommendations for terrestrial mollusk species <i>Megomphix hemphilli</i> the Oregon Megomphix. Version 2.0. Unpublished report to the Oregon Bureau of Land Management. 39 pp.
  3. Branson, B. A. 1977. Freshwater and terrestrial Mollusca of the Olympic Peninsula, Washington. The Veliger 19(3):310-330.
  4. Branson, B.A. 1980. Collections of gastropods from the Cascade Mountains of Washington. The Veliger, 23(2): 171-176.
  5. Frest, Terry. Deixis Consultants. Seattle, Washington
  6. Gaines, E. Zoology Data Manager, Oregon Natural Heritage Program, Oregon Field Office, Portland, Oregon. Pers. comm.
  7. Hodges, N.R. 2007. The terrestrial molluscs of an urban forest fragment in Portland, Oregon, USA. Tentacle, 15: 16-17.
  8. 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.