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Hello fellow members, I am new here. I am also new to the study of diptera. I always try to answer my own questions but a second opinion is comforting. I believe that I have made a few photos of Chaetorellia jaceae. I've searched for identification keys and I found a pdf book from the Royal Entomological society. Since I am new to this field, I am not sure about some of the terminology.

The keys for C. jaceae are as follows:
-anterior (towards head) supra-alar seta (hair) based on a yellow ground
-cell cup not extending beyond end of cell bm

here is the link to the pdf:
http://www.royens..._White.pdf
vide page 45 of 138 (page 42 of the actual page) for the keys

I do not know what the author means by "cell cup"
I think that the seta are based on a yellow ground.

I am hoping that an expert can confirm my identification of this species to be C. jaceae.

The possible species in Berlin are as follows:
Chaetorellia acrolophi
Chaetorellia jaceae
Chaetorellia loricata

I think that this fly is clearly not Chaetostomella cylindrica.
I've looked at Terellia tussilaginis and Orellia falcata but I cannot see a match.

Thank You very much.