Header image
Enter a name
Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Dorsal view of a Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

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 :)

Quick Reply

Related Discussions

Topic
Replies
Last Reply
1
May 26, 2018
by Taxon
20
Apr 23, 2013
by Entoman
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy