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Goldenrod gall fauna

Goldenrod gall fauna
Pennypack Restoration Trust, Montgomery County, Pennsylvania, USA
July 22, 2009
Size: Less than 2mm Gall 4-5mm
I never find more than one pupa, be it host or parasitoid, inside these little goldenrod galls (1, 2), and I have opened quite a few. So I was surprised to find three larvae. Is cannibalism going on?

More on goldenrod galls fauna.

Images of this individual: tag all
Goldenrod gall fauna Goldenrod gall fauna


Moved from ID Request.
Dr. Gagne thinks that these are parasitoids.

Moved from Flies.
Yes, they may Hymenopteran after all.

I'm not even sure whether these larvae are dipteran or hymenopteran, but I thought I'd pass along this information about Asphondylia solidaginis galls from Gagne (1): "Other gall midges have reportedly been reared from these galls: Trotteria caryae (Felt) and Camptoneuromyia adhesa (Felt). The first is an inquiline and the other two may also be." Yes, he says "the other two" even though he only mentions a total of two. You might try asking him for his thoughts--and perhaps he could tell us whether the adult midge currently in the guide is in fact this species or one of the inquilines (and maybe even shed light on your mystery).

I will do that
Thanks. We have several mysteries with all this goldenrod fauna. We could use some help.

Moved from ID Request.

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