[design image slice] U.S. Department of Agriculture Forest Service on faded trees in medium light green background [design image slice] more faded trees

Rocky Mountain Region

[design image] green box with curved corner [an error occurred while processing this directive] [design image] green and cream arch
[an error occurred while processing this directive]
[an error occurred while processing this directive]
[an error occurred while processing this directive]
[an error occurred while processing this directive]

Species Conservation Program: Species Evaluation Index — Mollusks

Species Conservation Project logo


Species occurrence on National Forest System units as portrayed by these tables is based on limited information available to evaluators at the time of preparation of species evaluations. Because these evaluations were intended to be sketches and not exhaustive, and because distribution information for many species is inadequate, the accuracy of these location tables cannot be ensured. Therefore, users must assume the responsibility of verifying that this information is accurate for individual forests.

NOTE: You will need Acrobat Reader to view the PDF documents. If you do not have Adobe Acrobat Reader, please click the above link to download and install this free program.

Recommendation: R2 Sensitive Species (SS)

Common Name Scientific Name 
Cooper's Rocky Mountain snail #1 | #2 Oreohelix strigosa cooperi
Pygmy mountainsnail Oreohelix pygmaea
Rocky Mountain capshell Acroloxus coloradensis

Recommendation: Not R2 Sensitive Species, But Should Be Considered For Other Emphasis Species Lists

Common Name Scientific Name 
callused vertigo Vertigo arthuri von martens
frigid ambersnail #1 | #2 Catinella gelida
lyrate mountainsnail Oreohelix haydeni haydeni
mystery vertigo Vertigo paradoxa sterki

Recommendation: Not R2 Sensitive Species and Not of Concern

Common Name Scientific Name 
cave physa Physella spelunca
clubshell Pleurobema clava
paper pondshell Utterbackia imbecillis
sharp sprite Promenetus exacuous
striate disc Discus shimekii

Recommendation: Insufficient Information Available to Make a Recommendation

Common Name Scientific Name 
creeper Strophitus undulatus
cylindrical papershell Anodontoides ferussacianus
pondhorn Uniomerus tetralasmus



[an error occurred while processing this directive]
USDA logo, which links to the department's national site. Forest Service logo, which links to the agency's national site.