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Hi Michel, onebody here ;)
I'm quite confident, that you are right with Dendrosoter and two visible characters lead to D. protuberans: the malar space is half the height of the compound eye - also the wing venation. If you still have the specimen, count the antennal segments: if 28-32, I think it is most probably protuberans.
https://www.resea...ae_in_Iran

Greetings, Eric