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