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As there is still experts' silence, I'd like to make a final decision myself and identify this Meiosimyza as M. rorida. After another careful examination of all pictures I find the following decisive characters:
(1) two sternopleural setae,
(2) row of anteroventral spines on fore femur (both seen on upper picure),
(3) acrostichal bristles on thorax irregularly quadriserial with those of two middle rows longer (in the lower picture, dorsocentral rows bold red, inner acrocentral rows bold blue, outer made of shorter bristles blue broken lines).
If there are any justified objections to this argumentation, I'd happily accept them, if you remain silent, M. rorida is fixed.
Regards, Sundew (self-made Meiosimyzist)