
Maple Bladder-gall Mite - side view, Heeswijk-Dinther, Netherlands
Growing on the upper side of a leaf of a Acer pseudoplatanus (Sycamore maple). This is a pretty good reference to learn about the different galls these trees may contain:
https://people.zeelandnet.nl/grada/gallen/W-Esdoorn.shtml

"Vasates quadripedes", the maple bladder-gall mite, is an eriophyid mite in the genus "Vasates", which causes galls on the leaves of silver maple, red maple, and sugar maple.
Similar species: Endeostigmatan Mites
By Ferdy Christant
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Uploaded Mar 28, 2020. Captured Oct 12, 2019 15:30.