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Yes Rui, it is true, it is L. dorsalis. I dindnt noticed this thread, because the word Platypezidae is not in the subject or the text, I am always serching for threads by this keyword, I am sorry I didnt react earlier.
I know this behavior from some other species, but I didnt film it yet. I am glad you did!
It is good to notice species of the tree or shrub, where platypezids do this movements.
Michal