Heptagenia?

wcoady

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Hello folks. I found this spinner and was wondering if it is the genus heptagenia. I’m sure it’s from the family heptageniidae. It’s body is about 13mm long. I found it by a wastewater plant about 1km from a large slow river. Location is Edmonton Alberta Canada.
Thank you.94EF5074-5F04-4A8A-AFF9-6EFE15C1834A.jpg
 

falcon53

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It may be the other "Green Drake" ... Litobrancha Recuvata that hatches much later than Ephemera Guttalata. Its sometimes referred to as the " Dark Green Drake". Just my guess from looking at the pic. A picture of the dun would be easier to identify. The spinner pictured might be too small for a Recurvata Drake which is Usually a size 12. My other guess would be one of the Cahill type mayflies (Heptagenia).
 
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dennyk

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Looks like a smaller version of these:



They were out last week while I was Smallmouth fishing. These are easily 30 mm in length. I'm pretty sure they are Hexagenia limbata or Giant Michigan Mayfly.

Denny
 

stenacron

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Two tails, wings at a 45* angle, light barring in the wings... Looks like a Stenacron (sp?) to me.

Then again, most things do. :p

Maybe something from the Light Cahill (common name) family.
 

stenacron

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No stripes on the forelegs is a point against this.
Good eye Redietz, and I agree. I was purposefully vague in my answer as there are 122 species of mayflies listed for Alberta… I’m guessing that less than 1/3 of which are available to – or of interest to – trout and anglers. If there’s a chance this insect emerged from a warmwater river then all bets are off as my knowledge of insects reaches only to those available to trout and worth imitating for anglers.

Back in PA I used to fish the Delaware River quite a bit during the summer (warmwater river) and there were all kinds of mayflies hatching that I couldn’t ID. Easy to place them in a general category – Stenacron, Isonychia, etc. – but almost impossible to nail down exactly as most angler’s entomology references stick strictly to coldwater insects.
 

Ard

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You guys are Great!

I had a very local knowledge when I lived and fished in Northcentral Pennsylvania but don't venture into these topics at this time. I was thinking of some members specifically when I bumped the thread and you didn't disappoint.

This is just another example of what makes this the best forum going!

Thank you
 
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