dagpauwoog

Metamorphosis is iodothyronine-induced and an ancestral feature of all chordates.[1] In insects growth and metamorphosis are controlled by hormones synthesized by endocrine glands near the front of the body (anterior). Neurosecretory cells in an insect’s brainsecrete a hormone, the prothoracicotropic hormone (PTTH) that activates prothoracic glands, which secrete a second hormone, usually ecdysone (an ecdysteroid), that induces ecdysis.[4] PTTH also stimulates the corpora allata, a retrocerebral organ, to produce juvenile …

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