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

by Paul S. Mikkelsen

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Term Definition

PROTOPLAX   One of the ACCESSORY PLATES in the Pholadacea; flat, spearhead-like accessory plate in one piece or divided longitudinally into two, situated at the anterior end of the dorsal margin in some pholadidae. see also: HYPOPLAX; MESOPLAX; METAPLAX; SIPHONOPLAX.

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