Ephemeroptera

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Related to ephemeropterans: Ephemeroptera
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Fig. 150 Ephemeroptera . Ephemera sp.

Ephemeroptera

an order of the class Insecta, containing the mayflies. They are EXOPTERGYOTES, and spend the great majority of their life in the nymphal stage and only a few minutes or hours in the nonfeeding, adult stage.