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Amnicola walkeri

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Canadian duskysnail
Scientific classification Edit this 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

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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

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The radula is amnicoloid.[1]

Distribution

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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

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This article incorporates public domain text from reference.[1]

  1. ^ a b c d e f g h i Pilsbry H. A. 1898. Notes on new and little known Amnicolidae. The Nautilus, volume 12 (4): 42-44.