Alvania densecostata

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Alvania densecostata
Alvania densecostata 001.jpg
Shell of Alvania densecostata (holotype)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Family: Rissoidae
Genus: Alvania
Species:
†A. densecostata
Binomial name
†Alvania densecostata
Harmer, 1920
Synonyms

† Rissoa densecostataA. Bell, 1893

Alvania densecostata is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae. [1]

Contents

Description

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]

Distribution

Fossils of this species were found in late Pliocene strata at St. Erth, Cornwall, Great Britain.

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References


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