An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
by Paul S. Mikkelsen

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Term Definition
ESCUTCHEON   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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