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

by Paul S. Mikkelsen

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Term Definition

CARDINAL AREA   In bivalves, situated more or less in the central part of the hinge area, immediately below the BEAKS. Flat or slightly concave, commonly triangular surface extending between beak and hinge margin in many bivalves, and partly or wholly occupied by LIGAMENT.

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