Alvania stigmata

Alvania stigmata
	Shell of Alvania stigmata (holotype)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Superfamily:	Rissooidea
Family:	Rissoidae
Genus:	Alvania
Species:	A. stigmata
Binomial name
	Alvania stigmata; Frauenfeld, 1867
Synonyms
	Alvania stigmatica Frauenfeld, 1867 (original incorrect spelling)

Alvania stigmata 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 2 mm, its diameter 1 mm.

(Original description in Latin and German) The conical shell is bulbous, obtuse and eroded. It is milky and somewhat translucent, with three to four spiral lines. The shell contains 5½ whorls, constricted at the suture. There are 16-17 straight vertical riblets, which are thicker on the upper part of the whorl and almost completely flattened on the lower part, with three or four more, less transparent visible spiral lines. On the body whorl around the umbilicus area there are three more very marked ones. The aperture is roundish. The outer lip contains a varix.

In specimens that have been lightly rubbed, the erpidermis is painted reddish-brown, and the protoconch also has a reddish-brown color.^[2]

Distribution

This species occurs in the Indian Ocean off the Nicobar Islands.

References

^ MolluscaBase eds. (2024). MolluscaBase. Alvania stigmata Frauenfeld, 1867. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=594827 on 2024-01-30
^ Frauenfeld, G. von. (1867). Mollusken. In: Reise der österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wüllerstorf-Urbair. Zoologischer Theil. Zweiter Band. Dritte Abtheilung. Wien: Karl Gerold's Sohn. 1-16 This article incorporates text from this source, which is in the public domain.

External links

Frauenfeld, G. von. (1867). Mollusken. In: Reise der österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wüllerstorf-Urbair. Zoologischer Theil. Zweiter Band. Dritte Abtheilung. Wien: Karl Gerold's Sohn. 1-16

[WoRMS-1] MolluscaBase eds. (2024). MolluscaBase. Alvania stigmata Frauenfeld, 1867. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=594827 on 2024-01-30

[2] Frauenfeld, G. von. (1867). Mollusken. In: Reise der österreichischen Fregatte Novara um die Erde in den Jahren 1857, 1858, 1859 unter den Befehlen des Commodore B. von Wüllerstorf-Urbair. Zoologischer Theil. Zweiter Band. Dritte Abtheilung. Wien: Karl Gerold's Sohn. 1-16 This article incorporates text from this source, which is in the public domain.

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