Amnicola dalli
| 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] | |
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.
- 1 2 3 4 5 6 7 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.)