- Nymph of Locust (Schistocera americana), showing wingrudiments.
The origin of insect wings remains, therefore, a mystery, deepened by the difficulty of imagining any probable use for thoracic outgrowths, comparable to the wingrudiments of the Exopterygota, in the early stages of their evolution.
The dragon-flies and May-flies are also active throughout their lives and possess external wingrudiments, though the young insects differ rather strikingly from their parents.
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