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Hi, Armen :)

No wonder you get confused. There are mistakes in the literature all over the place. It took us ages to put the correct pieces of the puzzle together. But you can trust the key on van den Broek & Álvarez Fidalgo (2017). The illustrated S. junceus is the holotype, and has reddish palpi and open m3. The S. elongatus wasn't a type specimen but came for an area where S. elongatus is present for sure. It was IDed by M. Hradsky and fits the original description very nicely.

And beware of the wing illustrations in Séguy (1927). The wing 149 is labeled as junceus and it is heteroneurus. And the wing 150 is labeled as elongatus while it is the real junceus. We seriously doubt that elongatus is present either in France or Spain. All points out to misidentifications using this work. If anybody knows of any confirmed or convincing record of elongatus from France or Spain, we would love to know :)

Regarding your fly, I cannot tell you something definitive at the moment, but it is NOT elongatus (but you already know that!). Unfortunately, I cannot read Russian and cannot use the key by Richter (1968). Hope Reinoud sees this thread and gives his opinion. He might have got the description translated by now ;)

All in all, it might be S. junceus (what I can see more or less fits, but that the wing veins should be paler). However, this group of species is in a taxonomic mess in Spain, and most likely the situation is similar in the rest of Europe.