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

by Paul S. Mikkelsen

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Term Definition

BASE   In coiled gastropods, the area below the periphery of the body whorl, excluding the aperture; opposite of APEX; in uncoiled or limpet-like gastropods, the apertural rim; also used, less precisely, for the flattened apertural side of cowries (Cypraeidae). In bivalves, the basal margin opposite the upper or hinge margin.

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