Amnicola walkeri

Amnicola walkeri
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. walkeri
Binomial name
Amnicola walkeri
Pilsbry, 1898[1]

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

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

The radula is amnicoloid.[1]

Distribution

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

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

  1. 1 2 3 4 5 6 7 8 9 Pilsbry H. A. 1898. Notes on new and little known Amnicolidae. The Nautilus, volume 12 (4): 42-44.
This article is issued from Wikipedia - version of the Friday, March 08, 2013. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.