The Laboulbeniales (Ascomycota) is an order of ectoparasitic fungus that have obligate associations with living arthropods, mostly insects. They have a basal cell that is able to penetrate the exoskeleton of its host, so they feed on the hemolymph.
With almost 2000 species known to science, the vast majority of the species that parasites Diptera are from the genus Stigmatomyces (145 spp. of 200).

Psilopa (Ephydridae) with Stigmatomyces 

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