Cirsonella extrema is a species of sea snail, a marine gastropod mollusk in the family Skeneidae.[1]

Cirsonella extrema
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Skeneidae
Genus: Cirsonella
Species:
C. extrema
Binomial name
Cirsonella extrema
Thiele, 1912

Description

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The height of the yellowish white shell attains 2.7 mm, its diameter 2.9 mm. The spire contains 3½ whorls. The round aperture is somewhat oblique. The peristome has a thickened callus, expanded on the left side. Its top is attached to the penultimate whorl. it covers mostly the umbilicus. The brownish operculum is rather thick and consists of polygyrous spirals.[2]

Distribution

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This marine species occurs in Antarctic waters off the South Shetland Islands at depths between 311 m and 426 m.

References

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  • Engl W. (2012) Shells of Antarctica. Hackenheim: Conchbooks. 402 pp.