The Leaf Blotch Miner Moths (Gracillariidae) hold the wings in a resting position in roof shape at a steep angle. All species are small or very small with a forewing length of 2 – 8.5 mm. They have a well-formed tongue and long antennas. The front legs are longer so that they stand on a raised leg. The main characteristic of this family is that they have two metamorphoses. The larvae hatching are legless and very flattened. At this stage, they mine in the epidermis of the plant. After a few molts, the larva develops legs and a cylindrical body. After another few molts, the pupal stage follows and then the transition to a moth.
New Oak Slender – 2019 (NL)
With its pale reddish-brown forewing with purple reflections, the New Oak Slender (Caloptilia robustella) is easy to recognize. Sometimes it is still confused with the Yellow-triangle Slender (Caloptilia alchimiella). A yellow triangular spot is visible halfway down the costa. The flying period in one generation is from May to August and the wingspan is 10-13mm. Host plant: Oak. Dutch name: Eikensteltmot. Frisian name: –