- The conical, spiral, or otherwise formed and chambered or septate interior skeleton of fossil cephalopods, contained in the anterior an element of the hole of a hollow difficult structure called the shield or rostrum. Its homologous because of the chambered shell of various other cephalopods. See cut-under belemnite.
- the slim conical chambered inner layer (either right or curved) of a belemnite
Hypernym for "phragmacone"
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