Higher classification Vallonia | Superfamily Pupilloidea Genus Vallonia Rank Species | |
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Similar Vallonia, Vallonia pulchella, Molluscs, Vertigo pygmaea, Cochlicopa lubrica | ||
Ribbed grass snail vallonia costata
Vallonia costata is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Valloniidae.
Contents
Description
For terms see gastropod shell
The 1.1-1.6 x 2.2-2.7 mm. shell has 3.2-3.3 whorls. Whorls are slightly angular at the periphery with deep sutures. The shell is flat with regular and widely spaced ribs. The shell is striated between the ribs, the last whorl is descending. The almost circular aperture is oblique (inclined downwards) and in adult specimens broadly reflected.The lip is thickened and reflected. Like other Vallonia the umbilicus is very wide. The shell is ivory-white. For differences from Vallonia pulchella see that species.
Distribution
This species occurs in countries and islands including:
References
Vallonia costata Wikipedia(Text) CC BY-SA