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There are several avenues for water loss from arthropods: the general cuticle, the respiratory surfaces via the spiracles (if these are present), the excretory system (of which the hind gut is usually but not always a part) and the mouth, through which material from the salivary glands and part of the alimentary canal may be discharged. We shall consider the extent, and the possibilities for control, of net outward flow of water through each of these channels. The present chapter is concerned with water loss through the cuticle, and in this regard considerations of size are of the greatest importance. This has been referred to before, and is illustrated in another context below (Chap. 5.A.).
KeywordsSurface Lipid Water Loss Rate Cuticular Lipid Cement Layer Pore Canal
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