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Hi Nikita,

I have never heart of territorial behaviour in the families Pallopteraidae and Opomyzidae, and never witnessed territorial behaviour in the field. However that doesn't mean it doesnot occur since my field experience is rather limited. I have seen the wing moving behaviour in species of the genus Geomyza but never got the impression the males used this behaviour towards eachother. I should spend more time next you on studying this behaviour!

Jan Willem