Alvania thouinensis

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Alvania thouinensis
Alvania thouinensis 001.jpg
Shell of Alvania thouinensis (holotype)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Superfamily: Rissooidea
Family: Rissoidae
Genus: Alvania
Species:
A. thouinensis
Binomial name
Alvania thouinensis
May, 1915
Synonyms

Alvania (Linemera) thouinensisMay, 1915 · alternate representation

Contents

Alvania thouinensis 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 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

This species in endemic to Australia and occurs off Tasmania.

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References

  1. ↑ 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
  2. ↑ 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 PD-icon.svg This article incorporates text from this source, which is in the public domain .


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