Spermodea lamellata

Spermodea lamellata
	A group of shells of Spermodea lamellata
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Order:	Stylommatophora
Family:	Valloniidae
Genus:	Spermodea
Species:	S. lamellata
Binomial name
	Spermodea lamellata; Jeffreys, 1830
Synonyms
	Acanthinula lamellata

Spermodea lamellata is a species of minute European land snail, a terrestrial gastropod mollusc, or micromollusc, in the family Valloniidae.

Description

For terms see gastropod shell.

The 2-2.2 mm x 2-2.2 mm shell has a characteristic semispherical shape like a bee skep basket. The shell has 6 convex whorls which increase gradually in size. The sutures are deep. The whorls are decorated with very fine, very regular, radial ribs. These ribs function as a diffraction grating, giving the yellow shell a silky appearance. The apertural margin is simple and breaks easily. There are no folds inside the aperture. The umbilicus is narrow. Juveniles are paler with weaker ribs at the lower side, and the umbilicus relatively wider.

Distribution

This species occurs in areas which include:

Denmark
Great Britain
Ireland
Czech Republic
Northern Germany^[3]
Netherlands - extinct^[4]
Norway
Poland - isolated locality
Portugal - isolated localities in Serra de Bussaco mountains (in Beira Alta), and in Sintra^[5]
Sweden
Ukraine^[6]
and other areas

Habitat

This minute snail lives in ancient woodland.

References

^ 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.
^ Janus, Horst, 1965. ‘’The young specialist looks at land and freshwater molluscs’’, Burke, London
^ "MollBase". Retrieved 2007-06-20.
^ [1] ANEMOON
^ AnimalBase :: Spermodea lamellata species homepage
^ Balashov I. & Gural-Sverlova N. 2012. An annotated checklist of the terrestrial molluscs of Ukraine. Journal of Conchology. 41 (1): 91-109.

External links

Spermodea lamellata at Animalbase taxonomy,short description, distribution, biology,status (threats), images

This Valloniidae-related article is a stub. You can help Wikipedia by expanding it.

[1] 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.

[2] Janus, Horst, 1965. ‘’The young specialist looks at land and freshwater molluscs’’, Burke, London

[mollbase-3] "MollBase". Retrieved 2007-06-20.

[4] [1] ANEMOON

[5] AnimalBase :: Spermodea lamellata species homepage

[Balashov-6] Balashov I. & Gural-Sverlova N. 2012. An annotated checklist of the terrestrial molluscs of Ukraine. Journal of Conchology. 41 (1): 91-109.

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