last stage in an insect's metamorphosis

In entomology, the imago is the last stage in the development of an insect. In an incomplete metamorphosis it comes after the last ecdysis.[1] If the metamorphosis is complete, it comes after emergence from the pupa. This is the only stage where the insect is sexually mature and (if a winged species) has functional wings. The imago is often referred to as the adult stage.

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  1. Sloughing off of epicuticle or exoskeleton during larval growth.