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Hi Jürgen!

Well, no. At least for me its ambiguous. It could mean either:

1) Its not possible to determine the genus Meromyza from pictures, i.e. Chloropidae is as close as you can get.
or
2) Its not possible to determine the species from pictures, i.e. Meromyza sp. is as close as you can get.

No offense, but this how I see it.

Greetings, Uli