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Why Caloptilia alchimiella as opposed to Caloptilia robustella?
...and looking again I think you are correct. The triangle on C. alchimiella extends apically along the outer edge, whereas on C. robustella it is more of an equal lateral, as in my image. However my judgement is based on scrutinizing images alone, and the addage, "It's not always possible to do ID's from images alone", could well apply here. So, should you still feel that this is Caloptilia robustella, then please use the, "Add a revised identification" option.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
Lat/Lng: 53.2055, -0.5631
OS grid ref: SK960685
Backies woods, Boultham Moor, Lincoln.