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Photo#308907
Another goldenrod gall resident

Another goldenrod gall resident
Pennypack Restoration Trust, Montgomery County, Pennsylvania, USA
July 13, 2009
Size: 2 mm.
This is one of the parasitoids of the gall maker. It may be the same species or a different one than the others found inside similar galls


This is the host, the midge Asphondylia solidaginis
Please, compare the size of the host and the parasitoid; they are about the same size. This is puzzling to me. A parasitoid should be smaller, unless it is feeding on something else in addition to the host. Does it feed on the plant or the symbiotic fungus, or what?
More on goldenrod gall fauna

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Another goldenrod gall resident Another goldenrod gall resident - Asphondylia solidaginis

Moved
Moved from Chalcid Wasps.

Moved
Moved from ID Request.

amazin shot!
i have always wondered what was inside those!

Looks like a chalcid
I'm not sure about the answer to your question about size. Since there are plant-feeding chalcids, it seems plausible that this species feeds on the plant in addition to, or instead of, the fly larva. I hope you get a more definite answer from someone.

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