The ecdysial glands of arthropods.

摘要: Publisher Summary This chapter focuses on the ecdysial glands (EGs) of arthropods. EG are present and producing a molt initiating hormone in those stages life cycle arthropods that will ultimately molt. These located anterior region body: prosoma arachnids, second maxillary or antennary segments crustaceans, head, neck, thorax insects. They range form from compact oval organs Brachyura certain lower insects, to extremely diffuse Lepidoptera Hymenoptera. typically composed single relatively large secretory cell type, but small hemocyte, tracheal epithelial, glial cells frequently associated with glands. Considerable morphological alterations characterize their cyclical activity. generally found only molt, for example immature insects most adult malacostracans, they usually regress after terminal