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or down as required.

Cephalopods with a wider siphuncle have a higher rate of metabolic activity.

Morphology

The siphuncle of fossilised cephalopods is assumed to have worked in the same general way as in living nautiluses. The siphuncle itself is only rarely preserved, but its shape can be inferred from hardened structures which lie around it. Many fossils show the holes where the siphuncle passes through each septum. Around these holes, the rim of the

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