Caloptilia cuculipennella (commonly known as the feathered slender)[1] is a moth of the family Gracillariidae. It is found in Holarctic Region, including most of Europe.[2]
The wingspan is 11–.The posterior tibiae are smooth above. Forewings are whitish, with numerous ochreous or brown strigulae finely irrorated with black; an obliquefascia near base hardly reaching costa, a second before middle hardly reaching dorsum, a third beyond middle interrupted in disc, and a costal spot at 3/4 ochreous or brownish, finely irrorated with black. Hindwings are dark grey. The larva is green -whitish; head and plate of 2 brown.[3] The moth flies from July to September.The larvae feed on Fraxinus excelsior, Ligustrum vulgare and Syringa vulgaris.