Clausilia bidentata

Clausilia bidentata, the two-toothed door snail, is a species of door snails, terrestrial pulmonate gastropod mollusks in the genus Clausilia belonging to the family Clausiliidae, all of which have a clausilium.

Subspecies

 * Clausilia bidentata abietina Dupuy, 1849
 * Clausilia bidentata bidentata (Ström, 1765)
 * Clausilia bidentata crenulata Risso, 1826
 * Clausilia bidentata moniziana Lowe, 1852

Distribution
This species is present in much of western Europe, including:


 * Czech Republic - in Bohemia only
 * Great Britain
 * Ireland

Habitat
This species is commonly found under bark of trees or in crevices of rocks. The snails are often encountered when they are most active, at night during wet weather, at which time they often climb up trees and feed on lichens.

Description
The shell of this snail is a small and cylindrical snail, very high-spired and narrow. The shell length reaches 10 - 11 mm. The shell is dark brown with noticeable spiral ribs, slight longitudinal grooves, and a horny operculum.