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Clausiliidae, common name door snails, are a taxonomic family of small, very elongate, mostly left-handed, air-breathing land snails, sinistral terrestrial pulmonate gastropod mollusks. With about 1,300 species recent and fossil, this belong among the most diverse families of land gastropods (cf. Orthalicidae, although the marine gastropod family Pyramidellidae is larger). Most species of Clausiliidae have an anatomical structure known as a clausilium, which enables the snail to close off the aperture of the shell with a sliding "door". ==Shell description== Almost all the species of snails in the family of door snails are left-handed, which is an uncommon feature in gastropod shells in general. These snails have shells which are extremely high-spired, with numerous whorls. The shells tend to be club-shaped, tapering at both ends to a rounded nub. The aperture usually has visible folds. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Clausiliidae」の詳細全文を読む スポンサード リンク
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