Cuttlebone

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, a family within the cephalopods.

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 cuttlebone
Fossil cuttlebone of the Pliocene species Sepia rugulosa
Fossilised cuttlebone-like gladius of Trachyteuthis[1]

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 Sepia apama, the giant Australian cuttlefish, which lives between the surface and a maximum depth of 100 metres.

Human uses

In the past, cuttlebones were ground up to make polishing powder, which was used by goldsmiths.[4] The powder was also added to toothpaste,[5] and was used as an antacid for medicinal purposes[4] or as an absorbent. They were also used as an artistic carving medium during the 19th[6][7] and 20th centuries.[8][9][10][11][12]

Today, cuttlebones are commonly used as calcium-rich dietary supplements for caged birds, chinchillas, hermit crabs, reptiles, shrimp, and snails. These are not intended for human consumption. [13]

It can also be used in the process of pewter casting, as a mould.

Jewelry making

Because cuttlebone is able to withstand high temperatures and is easily carved, it serves as mold-making material for small metal castings for the creation of jewelry and small sculptural objects.

Jewelers prepare cuttlebone for use as a mold by cutting it in half and rubbing the two sides together until they fit flush against one another. Then the casting can be done by carving a design into the cuttlebone, adding the necessary sprue, melting the metal in a separate pouring crucible, and pouring the molten metal into the mold through the sprue. Finally, the sprue is sawed off and the finished piece is polished.

Internal structure
3D visualisation of a Sepia cuttlebone by industrial micro-computed tomography
  • 3D view of part of a cuttlebone at low resolution.
  • Overview of a part at high resolution, about 5 µm/voxel.
  • Higher magnification.
  • Detailed view at very high magnification. Wall thickness of the vertical structures is about 10 µm.
Flight through the corresponding tomographic image stacks

See also

References
  1. Fuchs, D., T. Engeser & H. Keupp (2007). "Gladius shape variation in coleoid cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks" (PDF). Acta Palaeontologica Polonica 52(3): 575–589.
  2. 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): 212–212. Bibcode:2006E&PSL.247..212R. doi:10.1016/j.epsl.2006.04.025.
  3. Norman, M.D. 2000. Cephalopods: A World Guide. ConchBooks.
  4. "Uses for cuttlebone. The time when it was used as a medicine (1912) - on Newspapers.com". Newspapers.com. Retrieved 2016-01-21.
  5. "Do You Know THIS?". The World's News. 1950-07-08. p. 26. Retrieved 2016-01-21.
  6. "WESLEYAN ANNIVERSARY". Portland Guardian and Normanby General Advertiser. 1872-10-17. p. 2. Retrieved 2016-01-21.
  7. "CARNIVAL AT NORWOOD". Evening Journal. 1898-10-24. p. 3. Retrieved 2016-01-21.
  8. "Eleanor Barbour's Pages FOR COUNTRY WOMEN". Chronicle. 1942-07-16. p. 26. Retrieved 2016-01-21.
  9. "Note Book Cuttlefish". The Register News-Pictorial. 1930-05-17. pp. 3 S. Retrieved 2016-01-21.
  10. "INTERESTING HOBBIES Models from Cuttle-fish". The Age. 1950-06-30. pp. 5 S. Retrieved 2016-01-21.
  11. "BACK TO SEMAPHORE CELEBRATIONS". Port Adelaide News. 1929-12-13. p. 3. Retrieved 2016-01-21.
  12. "OUT Among The PEOPLE". The Advertiser. 1943-05-12. p. 6. Retrieved 2016-01-21.
  13. Norman, M.D. & A. Reid 2000. A Guide to Squid, Cuttlefish and Octopuses of Australasia. CSIRO Publishing.
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