Harvestman spiders like this Mitopus morio turn up quite frequently in our garden at this time of year and quite a few of them carry these little scarlet parasitic spider mites - which apparently are mite larvae belong to a genus called Leptus - attached to their legs and body.
I really need to catch one of these and take a look under the microscope - at this magnification they just look like little blobs of red sealing wax.
You can see another kind of parasitic mite, on bumblebees, here
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