Alvania densecostata | |
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Shell of Alvania densecostata (holotype) | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Gastropoda |
Subclass: | Caenogastropoda |
Order: | Littorinimorpha |
Family: | Rissoidae |
Genus: | Alvania |
Species: | †A. densecostata
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Binomial name | |
†Alvania densecostata
Harmer, 1920
| |
Synonyms | |
† Rissoa densecostata A. Bell, 1893 |
Alvania densecostata 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 3 mm, its diameter 1 mm.
(Original description) The solid, minute shell is elongate-turreted. The whorls are convex. They are ornamented by numerous fine, nearly straight ribs, crowded closely together, intersected by spiral striae which become stronger and more prominent below the periphery. [2]
Fossils of this species were found in late Pliocene strata at St. Erth, Cornwall, Great Britain.
This article needs additional or more specific
categories. (February 2024) |