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Larva on quaking aspen leaf

Larva on quaking aspen leaf
Scarborough Brook Conservation Area, Belchertown, Hampshire County, Massachusetts, USA
September 19, 2011


Moved from Flies.

I was thinking predatory Cecidomyiidae / Syrphidae but those would show more of a head. Miners should have burrowed into the leaf.

An agromyzid that popped out of the leaf before pupating is entirely plausible, but this reminds me more of a gall midge. I don't know what other possibilities there might be though.

Key thing about Cecidomyiidae
They have a "spatula" which you can see over by the mouthparts just sticking out a little. It's on the venter so it's hard to see in this image, and the larvae aren't very well represented here on the guide, but this image shows it clearly:

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