Английская Википедия:Amnicola dalli
Шаблон:Short description Шаблон:Speciesbox
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.[1]
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.[1]
The width of the shell is 2.30 mm. The height of the shell is 3.50 mm.[1]
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Drawing of the apical view of the shell.
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Drawing of the lateral view of the shell.
Anatomy
The jaw is thin and membranaceous.[1]
The formula off the radula is:[1] 34-23-7- Шаблон:Fraction -7-23-34.
Distribution
The type locality is mountain streams which are tributary to Pyramid Lake in northwestern Nevada.[1]
References
This article incorporates public domain text from reference.[1] Шаблон:Reflist
- ↑ 1,0 1,1 1,2 1,3 1,4 1,5 1,6 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.)
