Body whorl
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The body whorl is part of the morphology of the shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mo
View of the spire side of the planispiral shell of the freshwater snail Anisus septemgyratus. The body whorl is the outermost complete revolution of the shell spiral
Three shells of the sea snail species Turritella communis. The body whorl shows in this side view as the last complete turn of the shell spiral, the part of the shell that leads up to the aperture
Phragmocone
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The phragmocone is the chambered portion of the shell of a cephalopod. It is divided by septa into camerae.
Body whorl
…a nautiloid or ammonoid. The body of the animal occupies the living chamber, apart from the siphuncle which extends through the rest of the septa (the phragmocone) to provide buoyancy…
Cutaway of a nautilus shell showing the chambers