Pupa

A pupa is the life stage of insects from the Holometabola clade undergoing metamorphosis between immature and mature stages. Insects that go through a pupal stage are holometabolous: they go through four distinct stages in their life cycle, the stages thereof being egg, larva, pupa and imago (adult). The processes of entering and completing the pupal stage are controlled by the insect's hormones, especially juvenile hormone, prothoracicotropic hormone, and ecdysone.

The act of becoming a pupa is called pupation, and the act of emerging from the pupal case is called eclosion or emergence.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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