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I think this is a Sylvicola (Sylvicola) sp. but it is the first time I try to ID any of these :( Can it be confirmed? Any chance of telling which species? Or which sex? Any help or input will be most welcome ;)

Found in mixed woodland (mainly chestnut trees and oak) in Asturias, N Spain on 19.X.2014.

Thanks in advance!! :)