Alvania asperula
{{Short description|Species of gastropod}}
{{Speciesbox
| image = Alvania asperula 001.jpg
| image_caption = Shell of Alvania asperula (holotype)
| taxon = Alvania asperula
| authority = (Brugnone, 1880)
| synonyms_ref =
| synonyms =
- Alvania montagui var. asperula (Brugnone, 1880)
- Rissoa (Alvania) asperula Brugnone, 1880 superseded combination
|display_parents= 3
}}
Alvania asperula is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
MolluscaBase eds. (2024). MolluscaBase. Alvania asperula (Brugnone, 1880). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1759795 on 2024-09-12
Description
The length of the shell attains 4 mm, its width 2 ¼ mm.
(Original description in Italian) The shell is oval, ventricose, and somewhat acute. It consists of 7-8 convex whorls separated by deep, broad sutures. The first three whorls are smooth and embryonic, while the remaining whorls are marked by longitudinal ribs and transverse bands. Approximately 12 straight, slender ribs appear on the fourth whorl, gradually thickening or thinning before abruptly vanishing at the base. The body whorl bears 8-10 spiral bands or raised lines, while the penultimate whorl has 3–4, with both sets crossing the ribs and becoming granular at the intersections. The aperture is ovate-round, oblique, and slightly pointed at the top; the outer lip is thickened externally and grooved internally, while the inner lip is thin.{{cite journal |last1=Brugnone |first1=G. |title=Le conchiglie plioceniche delle vicinanze di Caltanisetta |journal=Bullettino della Società Malacologica Italiana. |date=1880 |volume=6 |page=127 |url=https://www.biodiversitylibrary.org/page/38908011 |access-date=12 September 2024}} {{source-attribution}}
Distribution
The holotype of this marine species was found as a fossil in Pliocene strata near Caltanisetta, Sicily, Italy.
References
{{Reflist}}
- {{cite journal |last1=Cachia |first1=C. |title=Updates to the marine malacofauna (Mollusca: Gastropoda) of Malta |journal=Bulletin of the National Museum of Natural History, Malta. |date=2024 |volume=1 |issue=1 |pages=17–18}}
{{Taxonbar|from=Q130286783}}