| Alvania cossmanni | |
|---|---|
 | |
| Shell of Alvania cossmanni (holotype) | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | †A. cossmanni |
| Binomial name | |
| †Alvania cossmanni Harmer, 1920 | |
Alvania cossmanni is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae. [1]
The length of the shell attains 1 mm, its diameter 1 mm.
(Original description) The minute, ovate shell is solid. The whorls are convex. The body whorl is ventricose and much the largest. The whorls are ornamented by very fine but distinct reticulate sculpture on the upper part of the body whorl. On the base and on the lower part they show rather strong spiral ridges. The spire is short. The aperture is subcircular and expanded. The suture is clearly marked. [2]
Fossils of this species were found in late Pliocene strata at St. Erth, Cornwall, Great Britain.
Alvania dictyophora is a species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania fischeri is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania punctura is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania zetlandica is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
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Alvania townsendi is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania verconiana is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania versoverana is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania belli is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania densecostata is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania dubiosa is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania erecta is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania obeliscus is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania partimcancellata is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania textiliformis is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
Alvania crassistriata is an extinct species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania enysii is an extinct species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania minuta is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
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