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Moscow region, 16 aug, very small 1,5-2mm.
1+2 dc, arista dorsaly long plumose.

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Now with image?

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Sorry

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Hi Nikita,

Are you really sure there are only 1+2dc present? You have to take care on this character. I have seen many specimens with narrow wings in which there seemed to be only two post-sutural dorsocentral bristles present. In most cases there actually were three. The first one was strongly reduced but still present in those cases. Studying the genitalia might be a wise!

TIP:
Next time you mount a specimen, I would advice you to glue the side of the thorax on the tip of the cardboard mounting point and leave the head and abdomen free. That makes it much easier if you need to cut the tip of the abdomen to boil it in a 10% KOH solution!

Jan Willem

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Well, Jan, I still couldn't find 1+3, but if realy 1+3 that what we have?
And once again, I've never seen Geomyza small like this one.
Nikita.
Re: TIP. It isn't my best pined Geomyza...

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Hi Nikita,

As far as I can judge from the photographs the wings look rather narrow which would point to Geomyza apicalis. This is a species that is highly variable in size and colouration. The best to do is study the genitalia in this case!

Jan Willem

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Hi Jan.
It is for the same place where I observe my Medetera = photo where I found O. punctella = where I collected first G. apicalis (by the way all G. apicalis I've seen, I've seen on tree bark of this tree). But realy tiny fly.
Nikita

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Hi Nikita,

I have seen very tiny specimens of G. apicalis, in a series of apicalis specimens from the same locality ranging from 2 mm - 3.2 mm. So I'm not surprised about tiny specimens of this species. But all I can say to make sure is that the genitalia need to be studied.

Jan Willem