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Photo#31848
Willow Gall Larva - Euura

Willow Gall Larva - Euura
Madison, Dane County, Wisconsin, USA
August 31, 2005
Size: 5 - 6 mm
A larva in a gall on willow. Perhaps a sawfly? I count six or seven prolegs. The gall is about a centimeter in diameter which would make the larva about five or six millimeters long. Since the larva is rather nondescript, can an id be made from the gall itself (second image)? In other words, are galls characteristic of a particular species?

These galls are common on the weedy willows around here. I'll save a few and see what emerges.

Images of this individual: tag all
Willow Gall Larva - Euura Willow Gall Larva - Euura

Moved
Moved from Chalcid Wasps. Several species of Pontania sawflies make similar galls on willow leaves.

Gall Wasp
(Note to self: comment on the first image in a post!)

I put a couple of these galls in a jar in the fridge for a few months. I recently removed the jar and what emerged is a 5 mm metallic blue-green chalcid wasp with orange-yellow legs and ruby-red eyes: . The gall images had ended up in the sawfly section. I moved them here to the chalcidoidea after seeing what emerged.

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