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OK, everybody makes this mistake once a lifetime (Seguy persisted in making this mistake).
Good for you you didn't trust yourself !

Rhinophoridae never have an appendix to bend in vein M.

If it does, and it is so blackish: Nyctia halterata (Sarcophagidae).

Which is very variable in the petiole !! (open, closed or petiolated like this one).


Theo