Amnicola dalli

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

Peninsula amnicola
Drawing of an apertural view of the shell and operculum of Amnicola dalli
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily:
Rissooidea
Family:
Amnicolidae
Subfamily:
Amnicolinae
Genus:
Amnicola
Species:
A. dalli
Binomial name
Amnicola dalli
Call, 1884[1]

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, shining, slightly striated and brown or greenish horn in color. The shell has 4 convex whorls that are gradually increasing in size. Suture is regularly impressed, somewhat deep.[2]

The aperture is rounded before, somewhat angular behind and bluish white within. The lip is simple, sharp, margins joined by a thick callus. The columella is rather reflexed.[2]

The width of the shell is 2.30 mm. The height of the shell is 3.50 mm.[2]

  • 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.[2]

The formula off the radula is:[2] 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 northwesternNevada.[2]

References

This article incorporates public domain text from reference.[2]

  1. Call R. E. 1884. Bull. U. S. Geol. Sur., No. 11, p. 45, Plate VI., Figs. 4-6.
  2. 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.)
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