Vertigo angustior

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.

Narrow-mouthed whorl snail
Six shells of Vertigo angustior, scale bar in mm

Near Threatened  (IUCN 3.1)[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
clade Orthurethra
Superfamily:
Pupilloidea
Family:
Vertiginidae
Subfamily:
Vertigininae
Tribe:
Vertiginini
Genus:
Vertigo
Species:
V. angustior
Binomial name
Vertigo angustior
Drawing: two views of a shell of Vertigo angustior

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

The species occurs in many countries in Europe and in Asia:[3]

Western Europe:

  • Great Britain in List of endangered species in the British Isles (Ireland, United Kingdom). Endangered in Great Britain.[4]
  • Ireland Conservation status: Vulnerable (VU)[5]
  • Belgium
  • France[6]
  • Liechtenstein
  • Netherlands[7]
  • Switzerland

Central Europe:

  • Austria
  • Czech Republic - vulnerable (VU).[8][9] 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.[10]
  • Germany
  • Hungary
  • Poland - endangered[11]
  • 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.

References
  1. Moorkens, E.; Killeen, I. & Seddon, M. (2012). "Vertigo angustior". IUCN Red List of Threatened Species. 2012: e.T22935A16658012. doi:10.2305/IUCN.UK.2012-1.RLTS.T22935A16658012.en.
  2. Jeffreys J. G. 1830. A synopsis on the testaceous pneumonobrancheous Mollusca of Great Britain. Transactions of the Linnean Society of London 16(2): 323-392.
  3. distribution
  4. 2000-2007. Action plan for Vertigo angustior Archived 2007-11-07 at the Wayback Machine. UK Biodiversity Action Plan. Joint Nature Conservation Committee.
  5. Byrne et al., 2009. http://www.npws.ie/en/media/NPWS/Publications/Redlists/RL2.pdf%5B%5D
  6. "Recherche de sites par espèce : Invertébrés : Vertigo angustior (Vertigo angustior)". 2007. Archived from the original on 2007-10-01. Retrieved 2007-05-14.
  7. "Vertigo angustior". 2005.
  8. "Evropsky významné lokality v České republice" (in Czech). 2003. Archived from the original on 2007-06-09. Retrieved 2007-04-30.
  9. "Red List of the molluscs (Mollusca) of the Czech Republic". 2006-07-14.
  10. (in Czech) 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.
  11. Vertigo angustior - Polish Red Data Book of Animals

Further reading
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