Alvania townsendi

Alvania townsendi
	Shell of Alvania townsendi (holotypz)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Superfamily:	Rissooidea
Family:	Rissoidae
Genus:	Alvania
Species:	A. townsendi
Binomial name
	Alvania townsendi; (Melvill, 1910)
Synonyms
	Rissoa (Apicularia) townsendi Melvill, 1910

Alvania townsendi is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.^[1]

Description

The length of the shell 2.75 mm, its diameter 1.75mm.

The small, white shell is inflated, very thin, fragile, undergrounded. The shell contains 3 to 5 whorls, of which the two apical ones are pearly, white. The others are graduated, ventricose and smooth. They are much impressed at the sutures. The shell is longitudinally obliquely ribbed. The ribs are indistinct and superficial. They disappear completely at the base and are spirally striated everywhere. The aperture is round and continuous, with a thin peristoma. The columella is slightly excavated.

This is an inflated, gradately-whorled Alvania of great tenuity, being evidently an abyssal species. It differs from Benthonellania charope (Melvill & Standen, 1901) altogetlier in sculpture, and also from Rissoa versoverana, both these being inhabitants of the same seas. This last is a much more solidly constructed shell, more compact, of brown colour, or white flecked with brown, two forms occurring, one of which, owing to its obese body whorl, the more approximates Alvania townsendi ^[2]

Distribution

The species occurs in the Gulf of Oman.

References

^ MolluscaBase eds. (2024). MolluscaBase. Alvania townsendi (Melvill, 1910). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=594829 on 2024-01-30
^ Melvill, J. C. (1910). Descriptions of twenty-nine species of marine Mollusca from the Persian Gulf, Gulf of Oman, and North Arabian Sea, mostly collected by Mr. F. W. Townsend, of the Indo-European Telegraph Service. Annals and Magazine of Natural History. ser. 8, 6: 1-17 This article incorporates text from this source, which is in the public domain.

External links

[WoRMS-1] MolluscaBase eds. (2024). MolluscaBase. Alvania townsendi (Melvill, 1910). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=594829 on 2024-01-30

[2] Melvill, J. C. (1910). Descriptions of twenty-nine species of marine Mollusca from the Persian Gulf, Gulf of Oman, and North Arabian Sea, mostly collected by Mr. F. W. Townsend, of the Indo-European Telegraph Service. Annals and Magazine of Natural History. ser. 8, 6: 1-17 This article incorporates text from this source, which is in the public domain.

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