Vertigo pygmaea (*)

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Mollusca
Classis: Gastropodae
Subclassis: Orthogastropoda
Superordo: Heterobranchia
Ordo: Pulmonata
Subordo: Eupulmonata
Clade: Stylommatophora
Cladus: Orthurethra
Superfamilia: Pupilloidea
Familia: Vertiginidae
Subfamily: Vertigininae
Tribus: Vertiginini
Genus: Vertigo
Species: Vertigo pygmaea

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Vertigo pygmaea, common name the "crested vertigo", is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae.
Shell extremely small, oval-cylindric and obtuse at the summit, of a more or less deep brown, smooth and little shining. Spire consist of 5 progressively increasing whorls.[3]

Aperture is scarcely longer than wide, and nearly round, furnished with 4 teeth, of which the superior is acute, two deeply placed inferior, and finally one on the columellar margin. A fifth tooth is often found in the base of the aperture. The lateral margin is slightly angular in the middle. Peristome is reflected below. Umbilical crevice quite pronounced.[3]

This snail lives under hedges.[3]

Distribution

Europe:

* Czech Republic
* Netherlands
* Poland
* Slovakia
* Great Britain
* Ireland
* Latvia
* and others

America:

* Michigan - special concern, see List of threatened fauna of Michigan

References

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

1. ^ IUCN 2007. 2007 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 26 August 2008.
2. ^ Draparnaud J. P. R. 1801. Tableau des mollusques terrestres et fluviatiles de la France. pp. [1-2], 1-116. Montpellier, Paris. (Renaud; Bossange, Masson & Besson).
3. ^ a b c d Pilsbry H. A. & Cooke C. M. 1918-1920. Manual of Conchology. Second series: Pulmonata. Volume 25. Pupillidae (Gastrocoptinae, Vertigininae). Philadelphia. page 174.