| Term | Definition |
| MESOPLAX |
One of the ACCESSORY PLATES in the Pholadacea, that straddles the two valves at the beaks; a transversely elongated accessory plate lying athwart the umbonal region in some Pholadidae; see also: CALLUM; HYPOPLAX; METAPLAX; SIPHONOPLAX. Photo: Martesia striata (Linne, 1758) |
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