An Illustrated and Cross-Referenced Glossary of Malacological and Conchological Terms |
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by Paul S. Mikkelsen |
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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