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The basicosta is creamy-white, and I think there are 3 postsutural acrostichal bristles (even if one is masked by the bright spot of light reflection). The mid tibia seems to bear a single anterodorsal bristle. The eyes of this male are separated by a rather wide gap. All these characters would point to the common Lucilia sericata. I wished we could see them more clearly!
Regards, Sundew