Alvania pinguis
| Alvania pinguis | |
|---|---|
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| Shell of Alvania pinguis (specimen at the Museum of New Zealand) | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | A. pinguis
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| Binomial name | |
| Alvania pinguis (W. H. Webster, 1906)
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| Synonyms | |
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Alvania pinguis is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.[1]
Description
[edit]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
[edit]This species occurs is endemic to New Zealand and occurs off Northland, off Great Barrier Island
References
[edit]- ^ 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,