Phragmocone
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The phragmocone is the chambered portion of the shell of a cephalopod. It is divided by septa into camerae.
Cutaway of a nautilus shell showing the chambers
Coleoidea
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Coleoidea or Dibranchiata is one of the two subclasses of cephalopod molluscs containing all the various taxa popularly thought of as "soft-bodied" or "shell-less". Unlike its sister groups, the shell
Phragmocone
…Ascocerida, dropped the phragmocone upon maturity, presumably to increase speed and maneuverability. They thus became the early Paleozoic equivalent of coleoids. The early coleoids and belemnoids adopted a different approach: the phragmocone was retained but became internal and reduced. The shells in modern…
Cuttlefish komodo large
Octopus vulgaris 2
Psychroteuthis glacialis
Taningia sp.