Alvania textiliformis
{{Short description|Species of gastropod}}
{{Speciesbox
| image = Alvania textiliformis 001.jpg
| image_caption = Shell of Alvania textiliformis (holotype)
| taxon = Alvania textiliformis
| authority = Harmer, 1920
| extinct=yes
|synonyms_ref=
|synonyms=
|display_parents= 3
}}
Alvania textiliformis is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.MolluscaBase eds. (2024). MolluscaBase. Alvania textiliformis Harmer, 1920 †. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1027572 on 2024-02-07
Description
The length of the shell is {{cvt|2.5|mm}}, and its diameter is {{cvt|1|mm}}.
(Original description) The minute shell is ovate-conical. It contains 5 or 6, slightly convex whorls. The body whorl is tumid, much the largest, measuring three-fourths the total length. The shell is ornamented by numerous exceedingly fine and delicate closely set longitudinal ribs, hardly reaching the base of the shell, clathrated by equally fine and inconspicuous spiral lines which are continuous and stronger towards the lower end. The suture is clearly marked, but not deep. The short spire is conical and regularly diminishes towards the apex. The aperture is ovate to subcircular, about half the total length, angulate above, rounded below, sometimes a little expanded.[https://www.biodiversitylibrary.org/page/36960258 Harmer F. W. (1920-1925). The Pliocene Mollusca of Great Britain, being supplementary to S.V. Wood's monograph of the Crag Mollusca. Vol. 2. Monographs of the Palaeontographical Society. 72(344): 485-652, pl. 45-52 (part 1, December 1920); 73(346): 653-704, pl. 53-56 (part 2, July 1921); 75(352): 705-856, pl. 57-64 (part 3, December 1923); 76(354): i-xiv, 857-900, pl. 65 (part 4, January 1925)]{{source-attribution}}
Distribution
References
{{Reflist}}
- Gürs, K & F. Weinbrecht. (2001). Die Gattung Alvania (Gastropoda, Rissoidae) im norddeutschen Miozän. Meyniana. 53: 75–88.
{{Taxonbar|from=Q106109621}}