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

by Paul S. Mikkelsen

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Term Definition

NUCLEAR WHORL   The early larval shell, sometimes distinguished from the PROTOCONCH. See illustration: Composite Gastropod. See also: ADULT WHORLS; VELICONCH.

POSTNUCLEAR WHORL   Any turn of a GASTROPOD shell formed after the formation of the NUCLEUS.

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