Alvania ignota

Alvania ignota
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Rissoidae
Genus:	Alvania
Species:	A. ignota
Binomial name
Alvania ignota Cecalupo & Perugia, 2009 [1]

Alvania ignota is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae. ^[2]

Description

The length of the shell is of small size (holotype 2,2 x 1,2 mm), the shell is conic-ovate, thick, has beaded spiral cords and convex whorls. It is imperforate, vitreous, and colourless.

Protoconch: 1,5 whorls (at 40X smooth).

Teleoconch: three convex whorls, suture impressed and wide. In the last whorl there are 7 spiral cords (3 of which are in the second whorl) with strongly circular beads when they are crossed by about 20 weaker axial ribs. The distance between 2° and 3° cord is larger. The mouth of the snail is oval in shape, with the outer lips having a strong varix. The snail has no umbilicus, while the Operculum and soft parts are unknown. ^[3]

Distribution

This species occurs in the Indian Ocean off Southern Madagascar; Réunion; Mauritius.

References

1. Cecalupo & Perugia (2009). Malacologia Mostra Mondiale 63 (2) : 21. World Register of Marine Species, Retrieved 08/09/10.
2. Alvania ignota Cecalupo & Perugia, 2009 . WoRMS (2010). Alvania ignota Cecalupo & Perugia, 2009. In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.eu/aphia.php?p=taxdetails&id=457017 on 9 August 2010 .
3. Jan, Delsing (9 February 2025). "Alvania ignota A. Cecalupo & I. Perugia, 2009". www.biolib.cz. Retrieved 9 February 2025.

• Cecalupo & Perugia (2009). Malacologia Mostra Mondiale 63 (2) : 21