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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
| Term | Definition |
| CARDINAL COSTA | Ridge or rib demarcating cardinal area from outer surface of shell. | |
| COSTA (pl. COSTAE) |
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. | |
| COSTATE |
Having rib-like AXIAL sculptural elements. See illustration: Composite Gastropod and Composite Bivalve. |
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| INTERCOSTAL | Of or in the spaces between ribs or COSTAE. | |
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