Amnicola dalli

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Peninsula amnicola
Amnicola dalli shell.jpg
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:
Genus:
Amnicola
Species:
A. dalli
Binomial name
Amnicola dalli
, 1884[1]

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

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

Subspecies[]

  • (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. ^ 1884. Bull. U. S. Geol. Sur., No. 11, p. 45, Plate VI., Figs. 4-6.
  2. ^ a b c d e f g 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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