{{Short description|Species of gastropod}} {{Speciesbox | image = Alvania stigmata 001.jpg | image_caption = Shell of ''Alvania stigmata'' (holotype) | taxon = Alvania stigmata | authority = Frauenfeld, 1867 | synonyms_ref = | synonyms = ''Alvania stigmatica'' <small>Frauenfeld, 1867</small> (original incorrect spelling) |display_parents= 3 }}

'''''Alvania stigmata''''' is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.<ref name="WoRMS">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</ref>

==Description== The length of the shell attains 2&nbsp;mm, its diameter 1&nbsp;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.<ref>[https://biodiversitylibrary.org/page/13188727 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] {{source-attribution}}</ref>

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

==References== {{Reflist}}

==External links== * [https://biodiversitylibrary.org/page/13188727 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]

{{Taxonbar|from=Q13308955}}

stigmata Category:Gastropods described in 1867