Operculum
From dinoflaj3
Revision as of 13:11, 2 December 2016 by Maintenance script (Talk | contribs)
The plate or group of plates lost in archeopyle formation and bounded by the archeopyle suture. If archeopyle formation results from the loss of a group of plates, the term operculum is applied only where they remain as a unit rather than separating into opercular pieces.