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An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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| by Paul S. Mikkelsen | |||
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| Term | Definition |
| BASAL FOLD | A fold (PLICA) near the anterior end of the columella and above the SIPHONAL CANAL; see also: COLUMELLAR FOLD. | |
| COLUMELLAR FOLD | A raised ridge on the COLUMELLA that follows the helical growth pattern of a gastropod shell.; see also: FUNICLE. | |
| FOLD | A spirally wound ridge on the COLUMELLAR WALL of the gastropod shell.; see also: COLUMELLAR FOLD; PLAIT; PLICAE; RUGA. | |
| UMBONAL FOLD | In pectinoid shells, the ridge originating at the UMBO and setting off the body of the shell from the AURICLE. | |
| Copyright ©Paul S. Mikkelsen, All Rights Reserved | Return to Home Page | Return to Top | Over 1700 Terms in the Glossary! |