Amnicola walkeri
| Canadian duskysnail | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Amnicolidae |
| Genus: | Amnicola |
| Species: | A. walkeri
|
| Binomial name | |
| Amnicola walkeri | |
Amnicola walkeri, common name Canadian duskysnail, is a species of freshwater snail, an aquatic gastropod mollusk in the family Amnicolidae.
The name is in honor of Mr. Bryant Walker.[1]
Shell description
[edit]The shell is thin, narrowly umbilicate, conic, shaped like Lyogyrus brownii Carpenter. The color of the shell is slightly yellowish corneous. The shell is thin, smooth, with faint growth-lines. The shell has 4 whorls that are very convex and separated by deeply constricting sutures. The last whorl is rounded below. The apex is obtuse.[1]
The aperture is oblique, rather small, mainly basal, a little longer than wide, but nearly circular. The inner margin is a trifle straightened above. The peristome is continuous, in contact with the preceding whorl for an extremely short distance above. Operculum is amnicoloid.[1]
The width of the shell is 2-2.125 mm. The height of the shell is 2.33–3 mm. The width of aperture is 1-1.125 mm. The height of aperture is 1.08-1.25 mm.[1]
Anatomy
[edit]Distribution
[edit]Type locality is Lake Michigan at High Island Harbor, Beaver Island, at 10 meters depth.[1]
Other localities include: Reed's Lake, Grand Rapids, Michigan; River Rouge, Wayne County, Michigan.[1]
References
[edit]This article incorporates public domain text from reference.[1]