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

by Paul S. Mikkelsen

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Term Definition

SPIRAL GROOVE   A GROOVE that encircles the spire of a shell. Revolving grooves going in the direction of the turning of the whorls. Coarser than a SPIRAL THREAD.
Photo by Marlo F. Krisberg; Echinolittorina riisei (Mörch, 1876).

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