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aptychus

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Aptychus

Ap"ty*chus\, n. [NL., fr. Gr. 'a priv. + ?, ?, fold.] (Zo["o]l.) A shelly plate found in the terminal chambers of ammonite shells. Some authors consider them to be jaws; others, opercula.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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