The most distinctive feature of this species is observed during its larval stage. Unlike other house moths, its larva moves around carrying a kind of case or sheath, which serves a dual purpose: protection and a food source.
This case is not something foreign that they find, but a structure that the larva itself builds using materials it finds in the environment.
Its production may contain traces of hair, textile fibers, plant remains, threads of clothing, grains of sand, dust and tiny fragments of animal or plant origin.
