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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Lateral view of a Female Sweltsa borealis (Chloroperlidae) (Boreal Sallfly) Stonefly Adult from Harris Creek in Washington
I was not fishing, but happened to be at an unrelated social event on a hill above this tiny creek (which I never even saw) when this stonefly flew by me. I assume it came from there. Some key characteristics are tricky to follow, but process of elimination ultimately led me to Sweltsa borealis. It is reassuringly similar to this specimen posted by Bob Newell years ago. It is also so strikingly similar to this nymph from the same river system that I'm comfortable identifying that nymph from this adult. I was especially pleased with the closeup photo of four mites parasitizing this one.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Taju has attached this picture to aid in identification. The message is below.
Taju
Hartola, Finland

Posts: 11
Taju on Nov 17, 2008November 17th, 2008, 1:44 am EST
Is it possible to determine this species at least to the genus level?
Taju
Hartola, Finland

Posts: 11
Taju on Nov 17, 2008November 17th, 2008, 1:48 am EST
....and it is from Kentucky, 24.9.2007.
Creno
Grants Pass, OR

Posts: 302
Creno on Nov 17, 2008November 17th, 2008, 3:19 am EST
The rounded wings and relatively thick antennae look like Pseudostenophylax sparsus. But wing venation is out of focus so cannot be sure.
Taju
Hartola, Finland

Posts: 11
Taju on Nov 17, 2008November 17th, 2008, 3:46 am EST
Are there any available pictures of the genitalia? My first thought was that it is like our Stenophylax-species (in Finland):) I suppose this is a common species?
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Nov 17, 2008November 17th, 2008, 4:54 am EST
Creno,

I remembered your comment about the thickness of P. sparsus antennae (made elsewhere), and given the limited choice of limnephilids represented in the collecting record for KY, P. sparsus seemed likely. My question: Other than the thickness of the antennae, what might help distinguish between (especially closed-wing) photos of Pseudostenophylax and Ironoquia?
Creno
Grants Pass, OR

Posts: 302
Creno on Nov 17, 2008November 17th, 2008, 5:33 am EST
Gonzo - yours is a better memory than mine - I will have to go back and see what I said then. This could indeed be Ironoquia - the hind wing doesn't look quite deep enough. A clear picture of the forewing (or hindwing)venation may resolve the question. At least in NA I believe the origination of vein R2 on the discoidal cell is anterior of the "chord" a greater distance than the tallest height of the discoidal cell for Ironoquia. In Pseudostenophylax, the R2 origination is much closer to the "chord," less than the discoidal height. If you get a good photo of the forewing, or have the specimen in hand it is quite apparent. I have sent Taju a pm for his email and I can send him a figure of the genitalia. I will also send the Ironoquia and he should be able to readily see the difference.
GONZO
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Nov 17, 2008November 17th, 2008, 5:41 am EST
Thank you. :)
Taju
Hartola, Finland

Posts: 11
Taju on Nov 18, 2008November 18th, 2008, 1:04 am EST
Thanks to the figures by Creno it is possible to ID the species as Ironoquia punctatissima (Walker, 1852). Thanks also to Gonzo :)

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