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Juga plicifera

(I. Lea, 1838)

Pleated Juga

GNRUnranked Found in 9 roadless areas NatureServe Explorer →
GNRUnrankedGlobal Rank
UnknownThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.1274301
Element CodeIMGASK4280
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryInvertebrate Animal
Endemicendemic to a single nation
KingdomAnimalia
PhylumMollusca
ClassGastropoda
OrderCaenogastropoda
FamilySemisulcospiridae
GenusJuga
Concept Reference
Strong, E.E., J.T. Garner, P.D. Johnson, and N.V. Whelan. 2022. A systematic revision of the genus Juga from fresh waters of the Pacific Northwest, USA (Cerithioidea, Semisulcospiridae). European Journal of Taxonomy 848: 1-97. Online: https://doi.org/10.5852/ejt.2022.848.1993
Taxonomic Comments
This is the broad concept of Juga plicifera that includes J. hemphilli, J. h. dallesensis and J. silicula. A systematic revision of the genus Juga found that almost all species previously considered valid were para- or polyphyletic grades of organization in shell morphology. Most species previously suggested to be putatively new were confirmed to be morphological variants of species already described (Strong and Whelan 2019, Strong et al. 2022). Based on this analysis, Strong and Whelan (2022) synonymize Juga hemphilli, J. hemphilli dallesensis, J. silicula and Indian Ford Juga (= J. hemphilli ssp 1 in this database) with J. plicifera.
Conservation Status
Threat ImpactUnknown
Range Extent20,000-200,000 square km (about 8000-80,000 square miles)
Range Extent Comments
This species is found in western Washington and Oregon, USA, primarily west of the Cascades from the Olympic Peninsula of Washington in the north to the Willamette River drainage in south-central Oregon (Branson 1977; Strong and Whelan 2022). Range extent range is based on element occurrence and GBIF data ((NatureServe 2025; GBIF 2025; RARECAT 2025).
Threat Impact Comments
Threats for this species have not been assessed.
Ecology & Habitat

Habitat

This species is found in both small creeks and large rivers (Strong and Whelan 2022).
Other Nations (1)
United StatesNNR
ProvinceRankNative
OregonS3Yes
WashingtonSNRYes
Threat Assessments
ThreatScopeSeverityTiming
Unknown/undetermined———

—

Roadless Areas (9)
Oregon (8)
AreaForestAcres
Drift CreekSiuslaw National Forest6,333
EagleMt. Hood National Forest16,841
FairviewUmpqua National Forest7,417
French Pete (a)Willamette National Forest1,668
Hebo 1aSiuslaw National Forest13,930
LarchMt. Hood National Forest12,961
Salmon - HuckleberryMt. Hood National Forest17,570
TahkenitchSiuslaw National Forest5,799
Washington (1)
AreaForestAcres
South QuinaultOlympic National Forest11,081
References (6)
  1. Branson, B. A. 1977. Freshwater and terrestrial Mollusca of the Olympic Peninsula, Washington. The Veliger 19(3):310-330.
  2. Global Biodiversity Information Facility (GBIF). 2025. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2025).
  3. NatureServe. 2025. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  4. <p>NatureServe's Rapid Analysis of Rarity and Endangerment Conservation Assessment Tool (RARECAT). 2025. Version: 2.1.1 (released April 04, 2025).</p>
  5. Strong, E., and N. Whelan. 2019. Assessing the diversity of Western North American Juga (Semisulcospiridae, Gastropoda). Molecular Phylogenetics and Evolution 136: 87-103.
  6. Strong, E.E., J.T. Garner, P.D. Johnson, and N.V. Whelan. 2022. A systematic revision of the genus Juga from fresh waters of the Pacific Northwest, USA (Cerithioidea, Semisulcospiridae). European Journal of Taxonomy 848: 1-97. Online: https://doi.org/10.5852/ejt.2022.848.1993