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Paul's, Stephane's and mine opinions are the same:
so far as nobody publish anything palludicola is a valid species.
I only wrote that at my unofficial opinion palludicola smells as species make up out of whole cloth (as well as several other Sciomyzidae, Euthycera sticticaria, for example).
As for palludicola: 1. The difference in genitalia are very doubtful my test, the matter of piont of view. 2. The colour of midstrip in female? Why not a variation? 3. The marriage of palludicola males and females. Nobody collected and examined any copulation pairs of palludicola, as far as I know. What is the reason to regard such males and females as conspecific? I can't see any...