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The red stuff are indeed fungi, apparently Stigmatomyces. As concerns the fly, missing of orbitals leads me to Leucopis, but I am not sure if the arista is bare or not. Anyway I do not know South American fauna of acalyptrates. Btw, years ago I found a Leucopis with such fungi on Canary Islands. The fungi seem to be undescribed. If you keep the creature from the picture, please let me know.