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3. Northern Ontario Canada, Stonefly question.

Hi, this is my first post on the site.
I was on a new river today not fishing just scouting and exploring with a friend. Anyhow I was looking for trout forage along the bank on this gem of a river section. I found a large group of stonefly shucks, mostly golden/ yellow SF's but I then found this Huge Green Stonefly shuck.( thought it could be a Dragonfly but wasn't sure.)
I brought it home to i.d. because I don't have a camara just a phone cam. searching Troutnut I think I identified it as a Gaint Salmonfly.
My question is, anyone here familiar with Northern Ontario aquatic insects
and is it possible that it is a Gaint Salmonfly?.
I have pics on my phone but not of the best quality, and the shucks are damaged from the trip back so I didn't post them. any help is appreciated.
Cheers.

Snowsquatch-

NatureServExplorer lists both Pteronarcys dorsata (American Salmonfly) and Pteronarcys proteus (Appalachian Salmonfly) as being present in Ontario.

Thank you Taxon for informing me of NatureServ site.

Not a true bug nut, but...I would think the big Salmonfly, and the golden, are not that much apart in size. Although you could be on each end of the size range of both.

Hi Sayfu -

I suspect that may be true in some watersheds where as you said extremes in size range may meet. This could be especially confusing when comparing different genders or development years. However, I've collected some pretty big mature Pteronarcys female nymphs from the Deschutes, Madison, and even Hat Creek over the years. Some of them reach almost 50mm with abdomens bigger around than a pencil! In terms of mass, I've never seen a Golden anywhere near their size. Though the Golden females can approach 40mm (interesting note: I've usually found these big ones in streams where Pteronarcys is lacking), they are much less corpulent, especially when viewed from the side. The males are substantially smaller than the females in both families. I assume these comparisons hold for the eastern species as well?