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Thanks for the higher resolution photo, it makes it possible to identify it. It's not Delia urbana Mall. because the prealar setae is too long, and the anteroventral seta on mid tibia is also much longer than urbana. It is Adia cinerella Fall. note the protruding mouth margin. This fly is an introduced fly to Australia, and breeds in dung. Now found in most parts of the world. Probably came over in the C19 on a ship, and has spread all over Australia