Alvania urgonensis is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.MolluscaBase eds. (2024). MolluscaBase. Alvania urgonensis Cossmann, 1918 †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=866085 on 2024-02-18
Description
The length of the shell attains 3.5 mm, its diameter is 1.25 mm. Distribution Fossils of this species have been found in the Barremian strata (Cretaceous) near Orgon, southern France after several research studies.
References
External links Cossmann, M. (1918). Les coquilles des calcaires d'Orgon (B.-du-R.). Bulletin de la Société Géologique de France, quatrième série. Cossmann, M. (1921). Essais de paléoconchologie comparée. Douzième livraison. Paris: [the author]. 349 pp., plates A-D, 1-6