What does "aptychus" mean?
Aptychus: A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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- Published: 2026-07-17T00:00:00-07:00 · Modified: 2026-07-17T00:00:00-07:00