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phragmocone (plural phragmocones)
- (zoology) The chambered portion of the shell of certain cephalopods, divided by septa into camerae. [from 19th c.]
- 2017, Danna Staaf, Squid Empire, ForeEdge, →ISBN, page 37:
- This ability to continuously add new buoyancy chambers to their phragmocones allowed ancient cephalopods to reach truly stupendous sizes.