Figures 6.9


Schematic diagram of the classical view of endocrine control of the epidermal processes that occur in molting and metamorphosis in an endopterygote insect.
Figures 6.9. Schematic diagram of the classical view of endocrine control of the epidermal processes that occur in molting and metamorphosis in an endopterygote insect.

This scheme simplifies the complexity of ecdysteroid and JH secretion and does not indicate the influence of neuropeptides such as eclosion hormone. JH, juvenile hormone; PTTH, prothoracicotropic hormone. (After Richards 1981)

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  The nymphal-imaginal molt of a male dragonfly of Aeshna cyanea (Odonata: Aeshnidae).
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  Diagrammatic view of the changing activities of the epidermis during the fourth and fifth larval instars and prepupal (= pharate pupal) development in the tobacco hornworm, Manduca sexta (Lepidoptera: Sphingidae) in relation to the hormonal environment.