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Hi,
does it sometimes occur that crossvein (which closes the discal cell, Dm-cu) is lacking?

I have some flies here (Empidoidea I assume) without discal cell, with a cell br, bm and cel cup, and vein M1 and M2 separate. The wing venation resembles mostly Opetiidae (like this: http://www.drawwing.org/insect/opetia-wing)

Jonas