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Aceria on an Acer. The first a gall-forming mite, the second a field maple
University of Edinburgh and Biodiversity Observatory (OU)
On Field maple, isn't this the one that is/was A aceriscampestris? I vaguely recall a name change?
Looking at Redfern & Shirley's key, there seem to be several spp it might be, and I was not confident to choose one. Looking again, I think that you are right and its A. aceriscampestris. The other one is bigger and is A. macrochelus. I don't know about a name change.
Lat/Lng: 52.0098, -0.708833
OS grid ref: SP887353