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1906) · alternate representation Alvinia (Linemera) pingue [sic] (misspelling) Rissoa pingue W. H. Webster, 1906 (superseded combination)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 small 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

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.

• 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