Alvania thouinensis is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.[1]
| Alvania thouinensis | |
|---|---|
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| Shell of Alvania thouinensis (holotype) | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | A. thouinensis
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| Binomial name | |
| Alvania thouinensis May, 1915
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| Synonyms | |
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Alvania (Linemera) thouinensis May, 1915 · alternate representation | |
Description
editThe length of the shell attains 1.8 mm, its diameter 0.8 mm.
(Original description) The minute, pure white shell is elongate. It contains 4½ whorls, including a smooth, shining protoconch of 1½ whorls.
The three adult whorls are rounded. The suture is canaliculate. The first whorl is widest at its lower third, where there is a keel, crossed by narrow axial riblets. These riblets continue on the other whorls, but disappear on the base. On the second whorl about four keels appear, which become stronger and more numerous on the body whorl, where there are about ten, and raise small nodules, where they cross the ribs. The aperture is pyriform. The columella is much rounded. The lip is somewhat expanded. The outer lip is thin and simple. [2]
Distribution
editThis species in endemic to Australia and occurs off Tasmania.
References
edit- ^ MolluscaBase eds. (2024). MolluscaBase. Alvania thouinensis May, 1915. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=594890 on 2024-01-30
- ^ May, W.L. (1915). Additions to the Tasmanian marine Mollusca, with descriptions of new species. Papers and Proceedings of the Royal Society of Tasmania. (1915): 75-99, pls 1-8
This article incorporates text from this source, which is in the public domain.
- Grove, S. 2011. Rissoidae - Rissoinae: Alvania (Linemera) thouinensis (May, 1915). A Guide to the Seashells and other Marine Molluscs of Tasmania website.
- Ponder, W.F. 2011. Rissoidae Card Catalogue. Australian Museum.
External links
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