cuttlebone

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      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 structure that the animal can fill with gas or liquid for buoyancy control. On the ventral (bottom) side of the cuttlebone is the highly modified siphuncle; this is the organ with which the cuttlebone is filled with gas or liquid. 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 a continental shelf.
      When the cuttlefish dies, only the cuttlebone remains and will often wash up on a beach.


      Human uses


      In the past, cuttlebones were ground up to make polishing powder, which was used by goldsmiths. The powder was also added to toothpaste, and was used as an antacid for medicinal purposes or as an absorbent. They were also used as an artistic carving medium during the 19th and 20th centuries.
      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.


      = Lime production

      =
      As a carbonate-rich biogenic raw material, cuttlebone has potential to be used in the production of calcitic lime.


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


      Internal structure


      The microstructure of the cuttlebone consists of two components, horizontal septa and vertical pillars. Both components are composed predominantly of aragonite. The horizontal septa divide the cuttlebone into separate chambers. These chambers are supported by the vertical pillars which have a corrugated (or "wavy") structure. The thickness of these pillars varies from species to species, but are typically a few microns thick. The horizontal septa are typically thicker than the vertical pillars and consist of a double-layered structure. The upper layer of the septa and walls consist of vertically aligned crystals, whereas the bottom sublayer consists of nanorods rotated with respect to each other to form a "plywood" structure. Overall, this chambered microstructure results in the cuttlebone having a porosity over 90% by volume.

      3D visualisation of a Sepia cuttlebone by industrial micro-computed tomography

















      Flight through the corresponding tomographic image stacks






















      Mechanical properties



      The cuttlebone has been studied extensively due to its ability to be simultaneously lightweight, stiff, and tolerant to damage. This combination of mechanical properties has led to research into cuttlebone-inspired biomimetic ceramic foams. In addition, due to its mechanical properties, cuttlebone has been used as scaffolding in superconductors and tissue engineering applications. The light weight of the cuttlebone derives from its high porosity (over 90% by volume). The stiffness of the cuttlebone arises from the chambered structure composition of approximately 95% aragonite (a stiff material) and 5% organic material. Since the stiffness of a composite will be dominated by the material with the largest volume fraction, the cuttlebone is also stiff. The specific stiffness of the cuttlebone in one species was measured to be as high as 8.4 [(MN)m/kg]. The most intriguing property of cuttlebone is its ability to tolerate damage given that aragonite is a brittle material. The high tolerance to damage can be linked to the cuttlebone's unique microstructure.


      = Deformation process

      =
      Due to the marine lifestyle of the cuttlefish, the cuttlebone must be capable of both withstanding large compressive forces from the water while avoiding sudden brittle failure. The cuttlebone of some species under compression has demonstrated a specific energy on par with some advanced foams made from more compliant materials such as metals and polymers. The high energy absorption is a result of several factors.
      The failure of the cuttlebone occurs in three distinct stages: local crack formation, crack expansion, and densification. Crack formation typically occurs in the middle of the vertical walls in the chambered structure of the cuttlebone. The location of crack formation is controlled by the waviness in the corrugated structure of the walls. The waviness of the walls in the cuttlebone provides an optimized balance between stiffness and brittleness of the overall structure. This wavy structure inhibits crack propagation, increasing the energy input necessary for failure. After sufficient damage has occurred to the walls of the cuttlebone, a process known as densification occurs whereby the walls gradually compact while fracture continues. Significant energy is dissipated in the continued cracking of the walls while densification is occurring. It has also been observed that under compressive stresses, the horizontally layered chambers of the cuttlebone will fail sequentially. While one chamber is undergoing fracture and densification, the other chambers will not deform until the septum between the chambers has been penetrated. The septum is significantly stronger than the vertical walls due to its "plywood" structure further increasing the total energy needed for complete structural failure of the cuttlebone.


      See also


      Argonaut (animal)
      Belemnoidea
      Gladius (cephalopod)
      Mollusc shell
      Nautilus


      Explanatory footnotes




      References



      Neige, P. (2003). "Combining disparity with diversity to study the biogeographic pattern of Sepiidae" (PDF). Berliner Paläobiologische Abhandlungen. 3: 189–197.


      External links



      Media related to Cuttlebone at Wikimedia Commons

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    Cuttlebone | Tortoise Forum

    Sep 19, 2024 · A cuttlebone found on the beach should be somehow rinsed well and desinfected: boiling it, leaving in the oven at 250F for 30 minutes. I'm not sure how to do it best, though. Pet stores sometimes can give away broken cuttlebones for free (they are of no use with the birds but fine for tortoises).

    Cuttlebone - Tortoise Forum

    Nov 16, 2009 · I have seen hatchling and young Russian tortoises eating calcium carbonate powder occasionally. If my adults have eaten cuttlebone it has been when they are outdoors, which may be a seasonal occurance. Sometimes outdoors the cuttlebone gets wet, then gets soft and breaks up easily so it isn't always easy to tell.

    Tortoise Block vs. Cuttlebone | Tortoise Forum

    Mar 28, 2011 · WalkingRock doesnt even acknowlegde the exisitance of a cuttlebone but he does show interest and will occationally take a nip of a Cactuse calcium block. we picked it up at the rep show in Dallas last month. I dont remember who makes it.

    Too much cuttlebone? | Tortoise Forum

    Jan 19, 2025 · My young Greek tortoise seems to be really munching on his cuttlebone lately and I’m wondering if maybe he lacked calcium with his previous owners or if there’s another issue. I think his last owners fed him mainly romaine, but I’ve been trying to give him a variety including some romaine, bok choy, collard greens, endive lettuce, and ...

    Cuttlebone alternatives? - Tortoise Forum

    Oct 25, 2021 · I know it sounds weird probably, but I have a decently large group of large pet snails and they need cuttlebone as well, but I can also make a calcium carbonate/water mixture in a silicone mold that is called a calcicake that replaces cuttlebone for them and wondered if anyone has tried something similar for tortoise.

    Cuttlebone vs. Calcium Supplements - Tortoise Forum

    Jan 13, 2012 · Wow, sounds like a lot of cuttlebone-munching going on over there! I have yet to see my Russians touch the ones in their pens. However, the redfoot I used to have did nibble on it from time to time, but not very often. Again, all these …

    When and how often to change Cuttlebone for tortoises

    Aug 28, 2018 · Yes bird cuttlebone is the same. I break the hard backing off if it before I offer it to my Tortoise. Just throw it anywhere in the enclosure and your Tortoise will munch on it when they need it. You can leave it in there till it's gone. My Tortoise cuttlebone has been in …

    How do torts know to eat cuttle bone? - Tortoise Forum

    Jan 7, 2020 · Cuttlebone is safer than eating rocks. Reactions: Abdulla6169, Gijoux, TammyJ and 1 other person. Jan 9 ...

    How much cuttlebone powder for baby sulcata - Tortoise Forum

    Oct 18, 2020 · Also I do feed him/her with grinded cuttlebone around 3 days a week (Monday wednesay friday) and vitamin supplement on sunday however im worried that im giving calcium too less as his top plastron has become hard however the …

    Won't eat cuttlebone | Tortoise Forum

    Dec 20, 2017 · Cuttlebone can be cleaned fairly well with a hard toothbrush and some elbow grease. That way it can last ...