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.
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]
^ Kuznetsov V.I., 1990 Gracillariidae ; in G.S. Medvedev (ed.): Keys to the insects of the europaean part of the USSR, Vol.IV: Lepidoptera, part 2 (english translation), Oxonian Press Pvt.Ltd., New Dehli, 1987