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Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure found in all members of the family Sepiidae, commonly known as cuttlefish.
Cuttlebone is composed primarily of aragonite. It is a chambered, gas-filled shell used for buoyancy control; its siphuncle is highly modified and is on the ventral side of the shell. The microscopic structure of cuttlebone consists of narrow layers connected by numerous upright pillars.
Depending on the species, cuttlebones implode at a depth of 200 to 600 metres. Because of this limitation, most species of cuttlefish live on the seafloor in shallow water, usually on the continental shelf.
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