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Some more comments about Limnellia.
The name of species depends on 2 or 3 spots on vein, which are pointed with lines on figures (Krivosheina, 2012).

On your photos I see 2 spots only, so it is to be quadrata. Tarsal segments of this species partly yellowish. Halters black.

But the wings are one above another.

The third spot may be possible under another angle of vision.

If you see 3 dark spots - the species may be stenhammari or fallax.

In this case you can check the coloration of halter

In Limnellia stenhammari halter is black and in L. fallax halter is yellow.

In Limnellia stenhammari legs completely black, including tarsi. In Limnellia fallax basal tarsomer yellow.