Amnicola dalli

Peninsula amnicola
Drawing of an apertural view of the shell and operculum of Amnicola dalli
Conservation status
Secure  (NatureServe) [1]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Amnicolidae
Genus:	Amnicola
Species:	A. dalli
Binomial name
Amnicola dalli (Pilsbry & Beecher, 1892)
Synonyms
Amnicola johnsoniPilsbry, 1899 (junior synonym) Lyogyrus dalliPilsbry & Beecher, 1892 (original combination)

Amnicola dalli, common name the peninsula amnicola, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Amnicolidae. ^[2]

The specific epithet is in honor of W. H. Dall.

Subspecies

• Amnicola dalli johnsoni (Pilsbry, 1899) North Peninsula Amnicola - image

Shell description

The shell is narrowly umbilicate, obtusely conical, and lustrous with a smooth surface and a light brown or greenish-horn coloration. It exhibits 4 convex whorls that gradually increase in size, separated by a regularly impressed, moderately deep suture.

The aperture is rounded anteriorly and somewhat angular posteriorly, with a bluish-white interior. The outer lip is simple, sharp, and connected by a thickened callus. The columella is moderately reflexed. ^[3]

The width of the shell is 2.30 mm. The height of the shell is 3.50 mm. ^[3]

• 
  Drawing of the apical view of the shell.
• 
  Drawing of the lateral view of the shell.

Anatomy

Drawing of the radula of Amnicola dalli.

The jaw is thin and membranaceous. ^[3]

The formula off the radula is: ^[3] 34-23-7- 3+1+3⁄1+1 -7-23-34.

Distribution

The type locality is mountain streams which are tributary to Pyramid Lake in northwestern Nevada. ^[3]

References

This article incorporates public domain text from reference. ^[3]

1. NatureServe. "Amnicola dalli". NatureServe Explorer. Arlington, Virginia. Retrieved 2 March 2026.
2. Amnicola dalli (Pilsbry & Beecher, 1892) . 23 January 2025. Retrieved through: World Register of Marine Species .
3. Call R. E. 1886. On certain recent, quaternary, and new fresh-water Mollusca. Proceeding Davenport Academy of Natural Sciences, volume V., page 2-4, plate I, figure 6. (Radula description and images of radula are by Charles Emerson Beecher.)

External links

• Johnson, P. D.; Bogan, A. E.; Brown, K. M.; Burkhead, N. M.; Cordeiro, J. R.; Garner, J. T.; Hartfield, P. D.; Lepitzki, D. A. W.; Mackie, G. L.; Tarpley, T. A.; Tiemann, J. S.; Whelan, N. V.; Strong, E. E. (2013). "Conservation status of freshwater gastropods of Canada and the United States". Fisheries. 38 (6).