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

by Paul S. Mikkelsen

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Term Definition

PRODISSOCONCH   [need definition].

DISSOCONCH   The postlarval shell of bivalves (and scaphopods?). See illustration: Composite Bivalve. See also: MESOCONCH; NEPIOCONCH; PRODISSOCONCH.

PRODISSOCONCH   A shell secreted by the LARVA or embryo and preserved at the BEAK of some adult bivalve shells or scaphopod shells; identical with VELICONCH when larva is PELAGIC. See illustration: Composite Bivalve. See also: DISSOCONCH; MESOCONCH; NEPIOCONCH; PRODISSOCONCH I; PRODISSOCONCH II; PROTOCONCH; VELICONCH.

PRODISSOCONCH I   Earlier-formed part of prodissoconch, secreted by the SHELL GLAND of the LARVA; = PRODISSOCONCH; PROTOSTRACUM; PRODISSOCONCH II.

PRODISSOCONCH II   Later-formed part of PRODISSOCONCH, secreted by the MANTLE edge; see also: PRODISSOCONCH I.

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