A stage in the development of certain insects, such as the May flies, intermediate between the pupa and imago. In this stage, the insect is able to fly, but subsequently sheds a skin before becoming mature. Called also pseudimago.

Winged, subadult (dun) stage in mayfly development.

the first winged stage of a mayfly. This is the only group to have a winged stage that molts. The final stage is the imago, or adult.