Alvania pinguis

Alvania pinguis
	Shell of Alvania pinguis (specimen at the Museum of New Zealand)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Superfamily:	Rissooidea
Family:	Rissoidae
Genus:	Alvania
Species:	A. pinguis
Binomial name
	Alvania pinguis; (W. H. Webster, 1906)
Synonyms
	Alvania (Linemera) pinguis (W. H. Webster, 1906) · alternate representation; Alvinia (Linemera) pingue [sic] (misspelling); Rissoa pingue W. H. Webster, 1906 (superseded combination);

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

Description

The length of the shell attains 2 mm, its diameter 1.25 mm.

(Original description) The white shell consists of 4½ rounded but slightly flattened whorls, of which a very glossy protoconch occupies the first one and a half.

Sculpture: Fine spiral lines, three on the third and four on the body whorl above the aperture. The spirals are crossed by close-set longitudinal ribs as strong as the spirals. They die out on a level with, the posterior angle of the aperture, and the base has three spirals only. The columella is vertically arcuated. The aperture is diagonal-oval, a little angled where the outer lip joins the columella, behind which is a deep groove. The outer lip is thickened externally, especially where it joins the body whorl. ^[2]

Distribution

This species occurs is endemic to New Zealand and occurs off Northland, off Great Barrier Island

References

^ MolluscaBase eds. (2024). MolluscaBase. Alvania pinguis (W. H. Webster, 1906). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=598547 on 2024-01-04
^ Webster, W. H. (1906). Results of dredging on the continental shelf of New Zealand. Transactions of the New Zealand Institute. 38: 305-308. This article incorporates text from this source, which is in the public domain.

Ponder, W.F. 1985 A review of the genera of the Rissoidae (Mollusca: Mesogastropoda: Rissoacea), Records of the Australian Museum
Powell, A.W.B. 1979 New Zealand Mollusca: Marine, Land and Freshwater Shells, Collins, Auckland (
Spencer, H.G., Marshall, B.A. & Willan, R.C. (2009). Checklist of New Zealand living Mollusca. Pp 196-219. in: Gordon, D.P. (ed.) New Zealand inventory of biodiversity. Volume one. Kingdom Animalia: Radiata, Lophotrochozoa, Deuterostomia. Canterbury University Press,

External links

[WoRMS-1] MolluscaBase eds. (2024). MolluscaBase. Alvania pinguis (W. H. Webster, 1906). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=598547 on 2024-01-04

[2] Webster, W. H. (1906). Results of dredging on the continental shelf of New Zealand. Transactions of the New Zealand Institute. 38: 305-308. This article incorporates text from this source, which is in the public domain.

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