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Thank you! That explains why I often have problems using the key in manual of palaearctic diptera! I thought Otitidae and Ulidiidae were the same.

I tried keying with Hennig 1949 and ended up with Timia protuberans. I could exclude the species described by Galinskaya. Unfortunately I don't have Zaitzev 1984, I will try to get it from the library.

See attached some extra photos from the head: