| Alvania sanctipaulensis | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Superfamily: | Rissooidea |
| Family: | Rissoidae |
| Genus: | Alvania |
| Species: | †A. sanctipaulensis |
| Binomial name | |
| †Alvania sanctipaulensis Lozouet, 1998 | |
Alvania sanctipaulensis is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae. [1]
The shell of Alvania sanctipaulensis reaches a length of 3 mm and a diameter of 2.75 mm. It features a high spire and fine axial ribs typical of the genus Alvania. The surface is ornamented with spiral striations, and the aperture is oval with a continuous peristome. The shell morphology suggests an adaptation to shallow marine environments with soft substrates.
Fossils of Alvania sanctipaulensis have been discovered in Oligocene strata of the Aquitaine Basin in southwestern France, particularly in sedimentary layers dated to the Chattian stage (approximately 28.4 to 23.03 million years ago). The species likely inhabited warm, shallow marine coastal environments typical of that period.
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