Moths, bees, butterflies, and flies can have large changes between developmental stages {metamorphosis}|. In first metamorphosis stage, egg develops. Then larva hatches from egg, crawls, eats, and looks worm-like. Larva is caterpillar for moths and butterflies, maggot for flies, and grub for bees. Larva molts several times, then makes pupa. Adult breaks pupa cocoon, pumps blood into folded parts, and secretes chitin to harden exoskeleton.
Chilling causes secretion of hormone {prothoracicotropic hormone} that induces prothoracic glands to secrete ecdysone.
Chilling secretes prothoracicotropic hormone, which induces glands {prothoracic gland} to secrete ecdysone.
Prothoracic gland secretes growth and differentiation hormone {ecdysone}, which produces molting fluid.
Metamorphosis hormones {juvenile hormone} can prevent pupa formation and allow molting.
Bee larva {grub}| molts several times.
Fly larva {maggot}| molts several times.
Moth and butterfly larva {caterpillar}| {larva} molts several times.
Last moth and butterfly larval stage is cocoon {pupa}| {chrysalis}, which has molting.
Collapsed folded adults {disc} can develop from special larva egg cells.
Insects can have dormant periods {diapause}| as adults.
Lepidoptera undergo metamorphosis through egg, larva, pupa, and adult {imago}.
4-Zoology-Kinds-Arthropod-Insect
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Date Modified: 2022.0225