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Jan, I believe Astiosoma (also in Asteiidae) has a posterior cv. (dm-cu), which Rui's fly seems to lack.

Rui: there is a third family in this mix: Xenasteiidae; these, asteiids and teratom's are all very closely related, and your fly is certainly one of these three. Unfortunately, all my printed literature is still at CDFA, and I now have access only to the common, internet-based stuff (which doesn't help here). There is a person who could ID your interesting fly at a glance: Dr. Amnon Friedberg, of Tel Aviv Univ.