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Thanks a lot, John!! :) :) That was much more than I could expect! :)

As I can see venation is peculiar in this genus:

http://www.diptera.info/forum/viewthread.php?thread_id=55985&pid=239076

Do you think we can be sure of the genus at least? It would be great but I have no means to be sure without other's help.

If it is indeed Stictochironomus, there are 3 species recorded for Spain in this genus. This would be clearly something to start my research! Thanks a lot!! ;)