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

by Paul S. Mikkelsen

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Term Definition

  Region of VALVE (in bivalves) surrounding point of maximum curvature of longitudinal DORSAL profile and extending to the BEAK, when not coinciding with it (many authors treat "beak" and "umbo" as synonymous, but with most shells, two distinct terms are needed). See illustration: Composite Bivalve. See also: NATES; PRODISSOCONCH.

See: Bivalve terminology, Anatomy of bivalves by Marlo Krisberg.

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