Belemnotheutis
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Belemnotheutis is an extinct coleoid cephalopod genus from the middle and upper Jurassic, related to but morphologically distinct from belemnites. Belemnotheutis fossils are some of the best preserved
Two drawings of Belemnotheutis phragmocones by Gideon Mantell.
Reconstruction of Belemnotheutis in life
Left and Center: erroneous reconstructions by Richard Owen. Right: a restoration by Joseph Pearce, the original discoverer of Belemnotheutis. It is also the illustration copied in 2008 using ~150 million year old ink recovered from the fossilized ink sac of Belemnotheutis antiquus.
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