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

by Paul S. Mikkelsen

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Term Definition

ANTEROVENTRAL   Being both forward and downward; toward the front and lower regions; see also: POSTEROVENTRAL.

ANTEROVENTRAL MARGIN   In bivalves, the anterior end of the valve margin opposite the hinge; See also: POSTEROVENTRAL MARGIN;

POSTEROVENTRAL   Being both rearward and downward; toward the rear and lower regions; see also: ANTEROVENTRAL.

POSTEROVENTRAL MARGIN   In bivalves, the posterior end of the valve margin opposite the hinge; = POSTEROBASAL MARGIN. See also: ANTEROVENTRAL MARGIN;

VENTRAL   Of, pertaining to, or situated on the lower side in a dorsoventral organism; on the apertural surface of a gastropod shell; at or toward that part of the bivalve shell opposite the HINGE; see also: DECURRENT; DORSAL.

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