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Photo#29201
aquatic leaf beetle - Donacia

aquatic leaf beetle - Donacia
Tobermory, Bruce, Ontario, Canada
August 10, 2005
Size: 7-8 mm
Among reeds in water-filled ditch. I think this is either a Plateumaris or Donacia species. Supposedly, one difference is that Plateumaris has "sutural margin of elytra sinuate at apex", and Donacia has a straight elytral margin. That area is hard to see in this photo. Maybe there's other differences that are visible?

Moved

can be safely moved to Donacia
*

I´d opt for Donacia
reasons:

dorsal surface a little opaque, elytra wedge-shaped, hind legs elongated.

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