出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/03/25 12:01 UTC 版)
The clausilium is a calcareous anatomical structure which is found in one group of air-breathing land snails: terrestrial pulmonate gastropod mollusks in the family Clausiliidae, the door snails. The clausilium is one part of the clausilial apparatus.