An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
|by Paul S. Mikkelsen|
In bivalves, a long, somewhat depressed area on the dorsal surface just posterior to the BEAKS. See illustration: Composite Bivalve. See also: LUNULE.
See: Bivalve terminology, Anatomy of bivalves by Marlo Krisberg.
|ESCUTCHEON RIDGE||Ridge extending posteriorly from beak in each valve (of bivalves) and forming border of ESCUTCHEON; see also: DEMARCATION LINE.|
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