protoplax

protoplax
n. [Gr. protos, first; plax, flat plate]
(MOLLUSCA: Bivalvia)
In Pholadidae, simple, nearly flat, dorsal chitinous or calcareous plate anterior to the umbo; see mesoplax, metaplax.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • mesoplax — n. [Gr. mesos, middle; plax, plate] (MOLLUSCA: Bivalvia) A calcareous transverse plate straddling the two valves on their dorsal margins; see protoplax, metaplax …   Dictionary of invertebrate zoology

  • metaplax — n. [Gr. meta, after; plax, plate] (MOLLUSCA: Bivalvia) A long narrow posteriorly pointed, rounded or forked accessory plate covering the gape between the two valves on the dorsal margins posterior to the umbo; see protoplax, mesoplax …   Dictionary of invertebrate zoology

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