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A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.

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Definitions

  1. n. A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.
  2. A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.
  3. A shelly plate found in the terminal chambers of ammoniteshells. Some authors consider them to be jaws; others, opercula.