Hard, brittle internal structure found in all members of the family Sepiidae
Top and bottom view of a cuttlebone, the buoyancy organ and internal shell of a cuttlefish
Cuttlebone of Sepia officinalis (left to right: ventral, dorsal, and lateral views)
Common cuttlefish Sepia officinalis
Tortoise with cuttleboneFossil cuttlebone of the Pliocene species Sepia rugulosaFossilised cuttlebone-like gladius of Trachyteuthis[1]
Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure (an internal shell) found in all members of the family Sepiidae, commonly known as cuttlefish, within the cephalopods. In other cephalopod families it is called a gladius.
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.[2] 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 (660 to 1,970 ft). Because of this limitation, most species of cuttlefish live on the seafloor in shallow water, usually on the continental shelf.[3]
The largest cuttlebone belongs to the Australian giant cuttlefish, which lives between the surface and a maximum depth of 100 metres.
^Fuchs, D.; Engeser, T.; Keupp, H. (2007). "Gladius shape variation in coleoid cephalopod Trachyteuthis from the upper Jurassic nusplingen and Solnhofen plattenkalks" (PDF). Acta Palaeontologica Polonica. 52 (3): 575–589.
^Rexfort, A.; Mutterlose, J. (2006). "Stable isotope records from Sepia officinalis — a key to understanding the ecology of belemnites?". Earth and Planetary Science Letters. 247 (3–4): 212. Bibcode:2006E&PSL.247..212R. doi:10.1016/j.epsl.2006.04.025.
^Norman, M.D. (2000). Cephalopods: A world guide. Conch Books.
Cuttlebone, also known as cuttlefish bone, is a hard, brittle internal structure (an internal shell) found in all members of the family Sepiidae, commonly...
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