An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms

by Paul S. Mikkelsen

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Term Definition

CLAUSILIUM
(=CLAUSIUM)
  A CALCAREOUS, loose "sliding door" in the Clausiliidae (Pulmonata) which fits into the grooves of the COLUMELLA, serving as a door. When not prevented by counteracting pressure, the clausilium springs forward on its elastic LIGAMENT and encloses the animal into its shell.
   


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