| Canadian duskysnail | |
|---|---|
Scientific classification  | |
| 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]
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]
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]
Paramelania damoni is a species of tropical freshwater snail with an operculum, an aquatic gastropod mollusk in the family Paludomidae.
Sinployea decorticata a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Charopidae. This species was endemic to the Cook Islands; it is now extinct.
Stagnicola utahensis, common name the thickshell pondsnail, is a species of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Lymnaeidae, the pond snails. This species is endemic to Utah Lake in the United States. The last living snails were found in the 1930s.
Gurmatia is an extinct small genus of pyramidellid gastropod mollusks or micromollusks in the family Pyramidellidae.
Vertigo lilljeborgi is a species of minute land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae, the whorl snails.
Amnicola missouriensis, common name the Missouri amnicola, is a species of freshwater snail, an aquatic gastropod mollusk in the family Amnicolidae.
Amnicola dalli, common name the peninsula amnicola, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Amnicolidae.
Pyrgulopsis deserta is a species of freshwater snail in the family Hydrobiidae, the mud snails. It is known by the common names desert springsnail, Virgin springsnail, and St. George snail. It occurs in southwestern Utah and northwestern Arizona in the United States.
Gulella systemanaturae is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Streptaxidae.
Hyperaulax ridleyi is a species of tropical air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Odontostomidae.
Amphibulima browni is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Amphibulimidae.
Chloritis vanbruggeni is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Camaenidae.
Chloritis togianensis is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Camaenidae.
Staffordia staffordi is a species of air-breathing land snail, terrestrial pulmonate gastropod mollusk in the family Staffordiidae.
Scutalus mariopenai is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Bulimulidae.
Bostryx chusgonensis is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Bulimulidae.
Bostryx fragilis is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Bulimulidae.
Scutalus phaeocheilus is a species of tropical air-breathing land snail, a pulmonate gastropod mollusk in the family Bulimulidae.
Madagasikara johnsoni is a species of tropical freshwater snail with a gill and an operculum, an aquatic gastropod mollusc in the family Pachychilidae.
Tylomelania helmuti is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.
This article incorporates public domain text from reference. [1]