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Dear Aka, as far as know, realy nobody can help you. I mean nodoby at all, not only in this forum. Anthomyiidae is difficult family, which badly needs full revision. There is some hearsay that this work is in process, but anyway not finished yet.
You can use this photo as good image of copulating Anthomyiidae sp. May be in future somebody ID it farther.
Nikita