Alvania verrilli
Species of gastropod
From Wikipedia, the free encyclopedia
Alvania verrilli is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.[1]
| Alvania verrilli | |
|---|---|
| |
| Shell of Alvania verrilli (holotype) | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | A. verrilli |
| Binomial name | |
| Alvania verrilli (Friele, 1886) | |
| Synonyms[1] | |
| |
Distribution
This marine species occurs in the lower Estuary of St. Lawrence
Description
The maximum recorded shell length is 2.9 mm.[2]
(Original description) The white, solid shell is ovo-elongate. It contains 5 convex whorls. The protoconch is obtuse and smooth. The suture is deep. The aperture is sub-circular. The sculpture consists of, about 20 strongly prominent axial ribs, and a microscopically minute and close spiral striation. There is no umbilicus but only a minute umbilical split. The outer lip is thickened.
The peculiar fine spiral sculpture causes this species to be readily distinguishable.[3]
