from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A stage in the development of certain insects, intermediate between pupa and imago, during which the insect can fly but must shed a skin before becoming mature.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. An imperfect or incompleted winged stage in certain pseudoneuropterous and neuropterous insects, succeeding the pupa, and preceding the imago. Also called pseudimago.
The subimago is covered with tiny water-repellent hairs that make it almost waterproof.
At the end of their development, juveniles swim to the surface where they moult into a sexually immature subimago stage.
Perhaps the subimago in this genus of Ephemerids, as in certain others, is the permanent aerial state of the female.