Vertigo genesii

Vertigo genesii, common name the round-mouthed whorl snail, is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusc or micromollusc in the family Vertiginidae, the whorl snails.^[3]

A fossil shell of Vertigo genesii.

Vertigo genesii
Drawing of the shell of Vertigo genesii.
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Vertiginidae
Genus:	Vertigo
Species:	V. genesii
Binomial name
Vertigo genesii (Gredler, 1856)[2]
Synonyms
Pupa genesii Gredler, 1856[2] Vertigo (Glacivertigo) genesii (Gredler, 1856) (unaccepted subgeneric classification) Vertigo (Vertigo) genesii (Gredler, 1856) · alternate representation

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.^[4]

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.^[4]

The width of the adult shell is 1.03–1.20 mm, the height is 1.63–2.00 mm.^[5]

Anatomy

The animal body color is raven-black. The tentacles are short, contracted in the middle.^[4]

Distribution and conservation status

Distribution

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

This species occurs in:

• British Isles (in the United Kingdom only): Great Britain. It is endangered in Great Britain^[6] 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.