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

by Paul S. Mikkelsen

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Term Definition

PROTOCONCH   The LARVAL shell, formed by all the nuclear whorls, of a gastropod shell; sometimes this includes (and sometimes excludes) the earlier NUCLEAR WHORLS. See illustration: Composite Gastropod. See also: DISSOCONCH; PRODISSOCONCH; SCAPHOCONCHA; TELEOCONCH; VELICONCH; = NUCLEUS.
See Marlo Krisberg's graphic Counting Protoconch Whorls.

Photo: Acteocina atrata Mikkelsen and Mikkelsen, 1984

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