Calcification as a means of stiffening cuticle is found in crustaceans and millipedes, and in a very small number of insects. It appears to give a product which is not so hard as that made possible by sclerotization—for instance the hardest parts of a crab are the sclerotized parts. In crustacea, calcification enables them to withstand considerable hydrostatic pressures and so to live in great depths of water. By contrast, calcification is reduced in pelagic species as this would make them too heavy.
KeywordsCitrate Sodium Chloride Carboxyl Calcite Lysine
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