Angle-spot Ladybird Scymnus frontalis
Also known as Angle-spotted Scymnus (e.g. in the Ladybirds field guide by Helen Roy and Peter Brown) or Angle-spotted Ladybird.
This was found by suction in an ex-arable meadow. It was 2.8mm long and I think the absence of any brown on the sides of the pronotum make it a female.
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female Angle-spot Ladybird Scymnus frontalis showing metasternal groove, Wendling Beck Environment Project (Norfolk, UK), 25th August 2025