(Hymenoptera), and Panorpida (Siphonaptera, Diptera, Trichoptera, Lepidoptera and Mecoptera).

Molecular analysis has clarified the group's phylogeny, as shown in the cladogram.

Description

The Endopterygota are distinguished from the Exopterygota ("external winged forms") by the way in which their wings develop. Endopterygota ("internal winged forms") develop wings inside the body and undergo an elaborate metamorphosis, holometabolism,

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