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Home/Species/ Northern Threeband

Humboldtiana ultima

Pilsbry, 1927

Northern Threeband

G2Imperiled Found in 1 roadless area NatureServe Explorer →
G2ImperiledGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.117193
Element CodeIMGASC4100
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicendemic to a single nation
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderStylommatophora
FamilyHumboldtianidae
GenusHumboldtiana
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 - Excel v3.1x
Review Date2018-12-15
Change Date2003-06-03
Edition Date2018-12-15
Edition AuthorsCordeiro, J.R. (2018); Opler, P.A. (1986)
Threat ImpactUnknown
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences6 - 20
Rank Reasons
This species has a restricted range within a large mountain region where only a single occurrence is well protected occurrence. Threats are present but have not been adequately assessed.
Range Extent Comments
This species occurs only in the Guadalupe Mountains along the Texas and Eddy Co., New Mexico border as far north as Dark Canyon, New Mexico (Metcalf and Smartt, 1997) and as far south as south of Guadalupe Peak with a single questionable locality (at this time needing identification confirmation) in San Luiz de la Paz, Guanajuato, Mexico (inaturalist, accessed 12/7/2018) .
Occurrences Comments
Limited to mesic sites in Guadalupe Mts. Because it is known only from the Guadalupe Mountains of New Mexico it is considered of restricted occurrence with a relatively large mountain range in New Mexico and similarly in the Guadalupe and Sierra Diablo of Texas.
Threat Impact Comments
Threats are general but not well assessed and there is not enough information to assign an overall threat impact.
Ecology & Habitat

Habitat

This species can be found amidst a mixture of rock rubble and leaf letter of deciduous trees, but not talus accumulations in NM (Metcalf and Smartt, 1997). In Texas, it occurs in leaf litter in mesic canyons of limestone mountains in forested ravines and rocky outcrops; in soil, and under rocks (Fulllington,1979). Guadalupe Mountain, TX, distribution occurs above 6500 feet elevation usually in forested ravines and rocky outcrops (Fullington, 1979).
Terrestrial Habitats
Forest - HardwoodWoodland - Hardwood
Other Nations (1)
United StatesN2
ProvinceRankNative
TexasS3Yes
New MexicoS2Yes
Threat Assessments
ThreatScopeSeverityTiming
6 - Human intrusions & disturbanceUnknownUnknownUnknown
7 - Natural system modificationsUnknownUnknownUnknown
7.1 - Fire & fire suppressionUnknownUnknownUnknown
7.1.1 - Increase in fire frequency/intensityUnknownUnknownUnknown
11 - Climate change & severe weatherUnknownUnknownUnknown
11.2 - DroughtsUnknownUnknownUnknown

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Roadless Areas (1)
New Mexico (1)
AreaForestAcres
South Guadalupe MountainsLincoln National Forest20,930
References (3)
  1. Fullington, R.W. 1979. The land and freshwater Mollusca of the Guadalupe Mountains National Park, Texas. National Park Service Transactions and Proceedings Series 4: 91-111.
  2. Metcalf, A.L. and R.A. Smartt. 1997. Land snails of New Mexico. Bulletin of the New Mexico Museum of Natural History and Science, 10: 1-145.
  3. 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.