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Photo#427111
Ophiogomphus colubrinus

Ophiogomphus colubrinus
Dead Horse Creek, 13 km W. of the Town of Marathon, Thunder Bay District, Ontario, Canada
July 8, 2010
Size: ~40 mm
Keyed out to this common snaketail

Very interesting...
If it is possible to do so with the live specimen, a shot from the side showing the unique aspect of the dorsal spines is also on my need to do list and would be most helpful. If ever you get another chance...

Also, an excellent paper by Elizabeth K Gibbs: "Spatial and Temporal Segregation Among Six Species of Coexisting Ophiogomphus in the Aroostook River, Maine" suggests that even in Ophiogomphus it can take more than a year to get to the point where the larvae are ready to become adults, especially if they miss the mass emergence period of early to late June...

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