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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, a family within the cephalopods. 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 . Because of this limitation, most species of cuttlefish live on the seafloor in shallow water, usually on the continental shelf.〔Norman, M.D. 2000. ''Cephalopods: A World Guide''. ConchBooks.〕 ==Human uses== In the past, cuttlebones were ground up to make polishing powder. The powder was added to toothpaste, and was also used as an antacid or as an absorbent. Today, cuttlebones are commonly used as calcium-rich dietary supplements for caged birds, chinchillas, hermit crabs, reptiles, and snails. It is not for human consumption. 〔Norman, M.D. & A. Reid 2000. ''A Guide to Squid, Cuttlefish and Octopuses of Australasia''. CSIRO Publishing.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「cuttlebone」の詳細全文を読む スポンサード リンク
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