Figures 6.10


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.
Figures 6.10. 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.

The dots in the epidermal cells represent granules of the blue pigment insecticyanin. ETH, ecdysis triggering hormone; EH, eclosion hormone; JH, juvenile hormone; EPI, EXO, ENDO, deposition of pupal epicuticle, exocuticle, and endocuticle, respectively. The numbers on the x-axis represent days. (After Riddiford 1991)

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  Schematic diagram of the classical view of endocrine control of the epidermal processes that occur in molting and metamorphosis in an endopterygote insect.
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  Growth and development in a marine midge, Telmatogeton (Diptera: Chironomidae), showing increases in: