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

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.

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