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

by Paul S. Mikkelsen

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Term Definition

  A thickened or extensive axial ridge indicative of a resting stage in the growth of the mollusc, as reflected in the shell; in some cases including all structures associated with interruption of growth. See illustration: Composite Gastropod. See also: INTERVARICAL SPACE; AXIAL RIB; LABIAL RIB; SCLEROCHRONOLOGY.

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