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

by Paul S. Mikkelsen

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Term Definition

DEMARCATION LINE   In bivalves, an imaginary line on the surface of valve originating at the BEAK and marking locus of points on successive positions of margin where transverse growth component has had maximum effect; forms dorsoventral profile when VALVE is viewed from one end; see also: CORSELET; DIAGONAL RIDGE; ESCUTCHEON RIDGE.

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