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Published online by Cambridge University Press: 31 May 2012
Any continuous or undivided sclerotized plate of the exoskeleton is known as a sclerite and when two sclerites are contiguous the line of junction or demarcation is commonly known as a suture. Sutures in this accepted sense are of three kinds. The most common is a depressed line at the bottom of a shallow furrow or sulcus which marks the position of an internal strengthening ridge. The ridge may be formed in tnro ways.