Vertigo angustior explained

Vertigo angustior, the narrow-mouthed whorl snail, is a species of minute land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae, the whorl snails.^[1]

Subspecies:

• † Vertigo angustior intermedia Schlickum & Strauch, 1979

Description

The shell measures 1.6 to 2.0 mm (mean: 1.8 mm) in height and 0.9 1.05 mm (mean: 1 mm) in width. It is oblong ovoid with 4.5 to 5.35 whorls (mean 5). The aperture is sinistral and relatively small. The aperture edge is bent (indented) and slightly thickened and the aperture is slightly notched, the notch continuing outside as a spiral groove. The aperture bears 5-6 mainly short denticles: 2 parietal; 2 columellar; 1 palatal, the latter relatively long. The shell is brown to yellowish brown or horn coloured and has a fine growth striation.

Distribution

• IUCN red list - conservation dependent
• It is mentioned in Annex II of the European Union's Habitats Directive.

The species occurs in many countries in Europe and in Asia:

Western Europe:

• Great Britain in List of endangered species in the British Isles (Ireland, United Kingdom). Endangered in Great Britain.^[2]
• Ireland Conservation status: Vulnerable (VU)^[3]
• Belgium
• France^[4]
• Liechtenstein
• Netherlands^[5]
• Switzerland

Central Europe:

• Austria
• Czech Republic - vulnerable (VU).^{[6] [7]} Its conservation status in the Czech Republic in 2004-2006 is bad (U2) in pannonian area and favourable (FV) in continental area in report for European commission in accordance with Habitats Directive.^[8]
• Germany
• Hungary
• Poland - endangered^[9]
• Slovakia
• Slovenia

Northern Europe: Denmark, Finland, Norway, Sweden

Eastern Europe: Belarus, Estonia, Latvia, Lithuania, Russian Federation, Ukraine

Southern Europe: Italy, Romania

Asia: Armenia, Azerbaijan, Georgia.

Further reading

• Zofia Książkiewicz. January 2008. The narrow-mouthed whorl snail Vertigo angustior (Pulmonata: Gastropoda: Vertiginidae) - distribution and habitat disturbance in northwestern Poland.
• Provoost, S.; Bonte, D. (Ed.) (2004). Animated dunes: a view of biodiversity at the Flemish coast [Levende duinen: een overzicht van de biodiversiteit aan de Vlaamse kust]. Mededelingen van het Instituut voor Natuurbehoud, 22. Instituut voor Natuurbehoud: Brussel, Belgium. ISBN 90-403-0205-7. 416, ill., appendices pp. Tentacle 16. 5–6.
• The narrow-mouthed whorl snail (Vertigo angustior) (1014) Conservation Status Assessment Report.
• Sysoev, A. V. & Schileyko, A. A. (2009). Land snails and slugs of Russia and adjacent countries. Sofia/Moskva (Pensoft). 312 pp., 142 plates.

External links

• Jeffreys, J. G. (1830). A synopsis of the testaceous pneumonobranchous Mollusca of Great Britain. Transactions of the Linnean Society of London. 16: 323-392
• Müller, A. (1838). Ueber einige vaterländische Landschnecken. Archiv für Naturgeschichte. 4, 1: 209-211, pl. 4. Berlin
• Michaud, A.-L.-G. (1831). Complément de l'Histoire des mollusques terrestres et fluviatiles de la France, de J.P.R. Draparnaud. i-xvi, 1-116, Errata (1 p.), 1-12, pls 14-16. (December). Verdun: Lippmann
• Schileyko, A. A. & Rymzhanov, T. S. (2013). Fauna of land mollusks (Gastropoda, Pulmonata Terrestria) of Kazakhstan and adjacent territories. Moscow-Almaty: KMK Scientific Press. 389 pp
• Vertigo angustior at Animalbase taxonomy,short description, distribution, biology,status (threats), images
• photo of Vertigo angustior
• https://web.archive.org/web/20081108053410/http://www.staff.amu.edu.pl/~polmal/smp/v115.htm
• MNHN, Paris: specimen

Notes and References

1. MolluscaBase eds. (2023). MolluscaBase. Vertigo angustior Jeffreys, 1830. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=426425 on 2023-02-07
2. 2000-2007. Action plan for Vertigo angustior . UK Biodiversity Action Plan. Joint Nature Conservation Committee.
3. Byrne et al., 2009. http://www.npws.ie/en/media/NPWS/Publications/Redlists/RL2.pdf
4. Web site: Recherche de sites par espèce : Invertébrés : Vertigo angustior (Vertigo angustior) . 2007 . 2007-05-14 . https://web.archive.org/web/20071001033746/http://natura2000.environnement.gouv.fr/especes/1014.html . 2007-10-01 . dead .
5. Web site: Vertigo angustior. 2005.
6. Web site: Evropsky významné lokality v České republice . 2003 . cs . 2007-04-30 . https://web.archive.org/web/20070609204537/http://stanoviste.natura2000.cz/index.php?page=zivocich_detail&ZivocichID=134 . 2007-06-09 . dead .
7. Web site: Red List of the molluscs (Mollusca) of the Czech Republic . 2006-07-14.
8. Dušek J., Hošek M. & Kolářová J. (2007) Hodnotící zpráva o stavu z hlediska ochrany evropsky významných druhů a typů přírodních stanovišť v České republice za rok 2004-2006. - Ochrana přírody, 62(5): appendix 5:I-IV.
9. http://www.iop.krakow.pl/pckz/opis.asp?id=238&je=en Vertigo angustior - Polish Red Data Book of Animals