Amnicola dalli
| Peninsula amnicola | |
|---|---|
| |
| Drawing of an apertural view of the shell and operculum of Amnicola dalli | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| (unranked): | |
| Superfamily: | |
| Family: | |
| Subfamily: | |
| Genus: | |
| Species: | A. dalli
|
| Binomial name | |
| 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.
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
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]
- ^ Call R. E. 1884. Bull. U. S. Geol. Sur., No. 11, p. 45, Plate VI., Figs. 4-6.
- ^ a b c d e f g 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.)