An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
|by Paul S. Mikkelsen|
|CARDINAL COSTA||Ridge or rib demarcating cardinal area from outer surface of shell.|
|A round-topped sculptural element, stronger than a cord, usually formed by periodic thickening of the outer lip in gastropods. Moderately broad and prominent elevation of surface of shell, directed radially or otherwise; see also: COSTELLA.|
Having rib-like AXIAL sculptural elements.
See illustration: Composite Gastropod and Composite Bivalve.
|INTERCOSTAL||Of or in the spaces between ribs or COSTAE.|
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