Vertigo genesii

Vertigo genesii, common name the round-mouthed whorl snail, is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusc or micromollusc in the family Vertiginidae, the whorl snails.

A fossil shell of Vertigo genesii.

Vertigo genesii
Drawing of the shell of Vertigo genesii.
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
Superfamily:
Pupilloidea
Family:
Vertiginidae
Subfamily:
Vertigininae
Tribe:
Vertiginini
Genus:
Vertigo
Subgenus:
Vertigo
Species:
V. genesii
Binomial name
Vertigo genesii
(Gredler, 1856)[2]
Synonyms

Pupa Genesii Gredler, 1856[2]

Shell description

The shell is very small, ovate, obtuse, indistinctly, spaced striate, glossy purplish brown. The shell has 4½ whorls, that are rather convex, high, rapidly increasing, joined by a somewhat impressed suture, the penult large, almost ventricose. Umbilical opening is moderate.[3]

The aperture is semirotund, nearly quadratic, without any folds. Peristome is scarcely expanded, thickened liplike, bordered with bluish black, the margins are connected by a very weak callus, the right margin is arched at the insertion.[3]

The width of the adult shell is 1.03–1.20 mm, the height is 1.63–2.00 mm.[4]

Anatomy

The animal body color is raven-black. The tentacles are short, contracted in the middle.[3]

Distribution and conservation status

This species occurs in:

  • British Isles (in the United Kingdom only): Great Britain. It is endangered in Great Britain[5] and it is listed in List of endangered species in the British Isles.
  • Continental Europe: Finland, Germany, Norway, Poland, Romania, Russian Federation, Sweden, and Switzerland.

References

This article incorporates public domain text from reference.[3]

  1. Moorkens, E. (2011). "Vertigo genesii". IUCN Red List of Threatened Species. 2011: e.T22936A9399069. doi:10.2305/IUCN.UK.2011-2.RLTS.T22936A9399069.en.
  2. Gredler V. 1856. Tirol's Land- und Süsswasser-Conchylien. I. Die Landconchylien. Verhandlungen des Zoologisch-Botanischen Vereins in Wien (Abhandlungen) 6: 25-162, Table 2, figure 3. (in German)
  3. Pilsbry H. A. & Cooke C. M. 1918-1920. Manual of Conchology. Second series: Pulmonata. Volume 25. Pupillidae (Gastrocoptinae, Vertigininae). Philadelphia. page 204.
  4. Vertigo (Vertigo) genesii (GREDLER, 1856) Archived January 5, 2005, at the Wayback Machine. In: The Vertiginidae of Poland, accessed 2 July 2009.
  5. 2001-2007. Action plan for Vertigo genesii. UK Biodiversity Action Plan, Joint Nature Conservation Committee.
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