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Moscow region, 14 july, 5mm, on Arctolis grandis.

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And as far as I understant it is male of same species?

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Hi Nikita,

I'ld put my money on Terellia (Cerajocera) tussilaginis.

Best wishes,

John

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Thank you John.
Is my Tephritidae key uncorrect? In it couplet dividing Orellia distans and Terellia tussilaginis is:
- an cell (=cup) with short tooth near A vein (not longer than bp cell (=bm)) - Orellia dicstans
- an cell (=cup) with long tooth near A vein (longer than bp cell (=bm)) - lead via Terellia tussilaginis.
I decided that tooth is short. Was I wrong?
Nikita

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Hi Nikita,

Nope your key is correct! But this is what I would call a long tooth on cell an. If you see the real O. distans, or a real Orellia, it is immidiately clear. There is however another difference between Orellia and Terellia, in Orellia there are two black spots at the sutur on the thorax, on which no(!) setae are implanted, whereas in Terellia there are no such spots at the suture.
A quick and dirty character in the field is that T. tussilaginis is very light yellow in colour, whereas O. distans is more dark, orange brown with even some grey (on abdomen or thorax, I 'm not entirely suren which).

Nevertheless it is very healthy and good to keep on being critical!

Best wishes,

John

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Thank you John.
I'm not critical, I'm simply trying to understand how to ID Tephritidae in case of your absence
Nikita

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That's what I mean with being critical! Isn't that the key to understanding!

Cheers,

John