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There is a 2009-paper about the mite Thinoseius fucicola on Coelopa seaweed flies, mainly the male ones:
https://academic.oup.com/ee/article-abstract/38/6/1608/360395?redirectedFrom=fulltext&login=false- (unfortunately w/o any picture)
Direct access to this paper, see reference list in the Wikipedia article about C. frigida:
https://en.wikipedia.org/wiki/Coelopa_frigida
Best regards,
Volker