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== Insectos ==
{{Panorama|Aeshna cyanea freshly slipped L2.jpg|1200px|Écdise da libélula ''[[Aeshna cyanea]]''}}
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Each stage of development between moults for insects in the taxon [[endopterygota]] is called an [[instar]], or stadium, and each stage between moults of insects in the [[Exopterygota]] is called a nymph: there may be up to 15 nymphal stages. [[Endopterygota]] tend to have only four or five instars. Endopterygotes have more alternatives to moulting, such as expansion of the cuticle and collapse of air sacs to allow growth of internal organs.
 
Cada estadio de desenvolvemento entre mudas nos insectos [[endopterigotos]] denomínase [[instar]] ou, simplemente, estadio, e nos insectos [[exopterigotos]] denomínase ninfa: pode haber ata 15 estadios ninfais. Os endopterigotos adoitan ter só catro ou cinco instars. Os endopterigotos teñen máis alternativas á mjuda, como a expansión da cutícula e o colapso de sacos aéreos que permite o cecemento de órganos internos.
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The process of moulting in insects begins with the separation of the cuticle from the underlying epidermal cells (apolysis) and ends with the shedding of the old cuticle (ecdysis). In many species it is initiated by an increase in the [[hormone]] [[ecdysone]]. This hormone causes:
* apolysis – the separation of the cuticle from the [[Squamous epithelium|epidermis]]