An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
|by Paul S. Mikkelsen|
A type of OPERCULUM that does not flex upon retraction.
See also: FLEXICLAUDENT.
See the 1998 article by Checa and Jiménez-Jiménez: Constructional morphology, origin, and evolution of the gastropod operculum..
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