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Photo#104104
Midge larva

Midge larva
Guelph, Wellington, Ontario, Canada
April 18, 2007
Size: 12 mm
A Chironomus, perhaps? In seasonal swamp. Swims in an "S" motion.

Images of this individual: tag all
Midge larva Midge larva Midge larva

Chironomid midge
for sure, but it is very hard to get an ID on the adults, and even harder on the larvae.

Im not sure about the abdominal appendages you showed, but I would guess they are either 'legs' to help the worm move on the bottom of the wherever it was swimming or like in mosquito larvae, anal gills.
I will definetely look into that by tomorrow, though

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