Alvania partimcancellata | |
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Shell of Alvania partimcancellata (holotype) | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Caenogastropoda |
Order: | Littorinimorpha |
Superfamily: | Rissooidea |
Family: | Rissoidae |
Genus: | Alvania |
Species: | †A. partimcancellata
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Binomial name | |
†Alvania partimcancellata
Harmer, 1920
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Synonyms | |
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Alvania partimcancellata is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae. [1]
The length of the shell is 3 mm (0.12 in), and its diameter is 1.5 mm (0.059 in).
(Original description) The minute shell is ovate. It contains 5 slightly convex whorls. They are regularly diminishing in size upwards, the body whorl much the largest. The spire measures about one-third the total length. They are ornamented by numerous longitudinal ribs, disappearing towards the periphery against a series of spiral ridges which continue to the base of the shell, with a single line near the suture. The suture is slightly channelled. The aperture is oval. [2]
Fossils of this species were found in late Pliocene strata at St. Erth, Cornwall, Great Britain.