Caloptilia robustella

Caloptilia robustella (commonly known as new oak slender)^[2] is a moth of the family Gracillariidae. It is known from all of Europe, except the Balkan Peninsula.

New oak slender
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Lepidoptera
Family:	Gracillariidae
Genus:	Caloptilia
Species:	C. robustella
Binomial name
Caloptilia robustella Jäckh, 1972[1]

The wingspan is 10–13 millimetres (0.39–0.51 in). To differentiate this species from Caloptilia alchimiella requires microscopic examination of the genitalia.^[3][4]

There are multiple generations per year, with adults on wing between April and November.^[5]

The larvae feed on Fagus sylvatica and Quercus robur. They mine the leaves of their host plant.^[6]