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

by Paul S. Mikkelsen

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Term Definition

CALLUM   Shell material filling a gape between valves in certain bivalves. Secondary CALCAREOUS structure present in some Pholadidae, forming anterior extension of shell proper and closing PEDAL GAPE in adult. Example: the MESOPLAX in Martesia striata (Linne, 1758).

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