The female has reduced wings and remains in the caterpillar bag.

On the red body there are black dorsal shields, which are segmented by yellow stripes.

[1] Like many Psychidae, the caterpillar weaves itself into a silk sack to which it attaches foreign materials.

The entire structure is shorter than 20 millimetres and is spun to the food plants.

[1] Content in this edit is translated from the existing German Wikipedia article at de:Epichnopterix plumella; see its history for attribution.