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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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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Female Claassenia sabulosa (Perlidae) (Golden Stone) Stonefly Adult from the Touchet River in Washington
I think this is one of the most poorly understood of the golden stoneflies. It is rare to see any articles about it or fishing the hatch. It emerges late in summer usually on medium to large rivers.The adults are quite secretive but it is something to see the adults run across the water surface. These guys can really run. The males have short wings.The females are up to 1 1/4 inch long rivaling the salmonfly as the largest adult stonefly in the west.The adults are not real golden in color, especially the females which are more of an off yellow to off white abdomen. In handling the adults it is obvious that they shun direct sunlight. I find them by turning over rocks close to the water's edge.
Flymonster's profile picture
Eugene, Oregon

Posts: 4
Flymonster on Sep 7, 2011September 7th, 2011, 8:15 pm EDT
Is this the species known commonly as Short-winged Stonefly?

Fish or not to fish, there is no question.
Site Editor
"Bear Swamp," PA

Posts: 1681
GONZO on Sep 7, 2011September 7th, 2011, 8:23 pm EDT
Posts: 560
Sayfu on Sep 10, 2011September 10th, 2011, 5:42 am EDT
This bug is a happening out on my South Fork of the Snake. What is misunderstood is the fact that ONLY the males have short wings, and can not fly, or if they do, just short "hops". They scurry around on the small Island rocks exposed by the dropping water in the Fall, or late Summer. The females are bigger, and fly well, always flying up river egg laying very early in the morning. Some guides schedule to put in at 4:30 in the AM to time these female flights/egg laying flights. Big golden stone dries are fished around the overhanging branches. And one the rocky Island banks, and off the drop off ends of these rock islands Chernobyl ants are surface dragged to imitate the males that will skitter over the surface if when they get blown into the water...many think both male and females are mutants..not so.
Posts: 560
Sayfu on Aug 15, 2012August 15th, 2012, 7:32 am EDT

The question I see raised out my way, is are these Mutants, or short-wings as they are called closely related to the Golden Stone, or not? A number of our guru's out here call them a late golden stone not wanting to mix words I guess. I asked Jay Buchner, a great fly tier and bug expert from Jackson, Wy. this question at our big fly tying Expo this Spring..he shrugged his shoulders) The confusion I have as well, is I don't put in early enough to see these early hour upriver migrations of females along the brushy banks egg laying. What I see when I put in at gentleman's hours are big winged critters, their wings shining in the sunlight flying overhead, and not knowing if they are a female Mutant stone, or a Fall Caddis, (dicosmoecis) I see the fly shop at our lodge at the head of the SF canyon lists SF hatches, and lists the Fall Caddis with an (*) saying (need more info) Wish I could catch one, but when I see them flying it is around lunch time. :)
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Aug 15, 2012August 15th, 2012, 10:22 am EDT
Hi Jere-

I assume your question pertains to the Shortwinged Stone (Classennia sabulosa), whose adult males are shirt-winged and adult females are full-winged. The answer is yes, they are closely related to the Golden Stones (Calineuria californica, Hesperoperla pacifica, and Doroneuria baumanni), as all four are in stonefly family Perlidae.
Best regards,
Roger Rohrbeck
Posts: 560
Sayfu on Aug 21, 2012August 21st, 2012, 8:09 am EDT

And the ones doing the running are the males. The water drops on our tailwater SF of the Snake Canyon...water coming out of Palisades, and rocky Islands are exposed. These "Mutant" as they are called, or Short-winged stones (males) crawl out when the water drops, and it just dropped a bunch last nite! You seldom see these males getting blown in, or short hop flights onto the water because the surface water is often broken, and they lay so flat to the water, but they do skitter across the water. The technique is to anchor up, or the oarsman has to hold back on the oars, and you fish your Chernobyl Ant type pattern dead drifted till in nears 3/4 through the drift, and then raise the rod tip, and skitter it back towards the rocky bar. Strikes can be arm jolting. 2x, and 3x tippets at the smallest. You can get out on a rocky bar, and see these dark males scurrying over rocks, and they are very difficult to catch they are so quick.
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PaulRoberts on Aug 21, 2012August 21st, 2012, 8:42 am EDT
Nifty. Thanks for sharing that Jere. Claasenia is one of two large stones here (along with Hesperoperla) that come in any numbers.
Posts: 1
ROBS on Sep 6, 2012September 6th, 2012, 3:19 pm EDT
Nice to know what these guys are. I collected a few on the Metolius in Central Ore. the last couple of days and was intrigued because they were all wrong to be the golden stones that should have been there. A guy I talked to tried to convince me they were Alderflies, but I knew that was wrong.
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Sep 9, 2012September 9th, 2012, 11:37 pm EDT
Welcome to the forum, Robs!

Yes, most of the western species of the family Perlidae (Golden Stones) are a late Spring/early Summer phenomenon. The late Summer/early Fall hatching perlid species of the Claassenia genus (Fall Short-winged Stone) does belong to the same family, but confuses a lot of western anglers without an entomological bent. For that matter, so does the late Winter/early Spring hatching Skwala genus of the entirely different family Perlodidae (Springflies). What makes it a little easier (unlike the other species under discussion) is that the Classenia genus has only a single species recognized for North America and it is the only western NA species of the entire perlid family that hatches in the late Summer through the Fall.

I really enjoy aquatic entomology beyond its significance to my fishing and have spent quite a bit of time studying up on the topic over the years. Even so, I'm not embarrassed to admit these guys confused me for quite awhile. They all look fairly similar unless you know what to look for (the differences are pretty subtle)... :)

Best regards,
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Posts: 560
Sayfu on Sep 10, 2012September 10th, 2012, 6:07 am EDT

What I see is a significance to flyfishing for most all of them...I can eliminate their importance to flyfishing, identify important stages to my flyfishing importance, know where they can be found in the river/lake structure, and more. Appears to me most anglers want to discard all of that information as trivial, and not worth understanding.
PaulRoberts's profile picture

Posts: 1776
PaulRoberts on Sep 10, 2012September 10th, 2012, 7:26 am EDT
I found C. sabulosa emerging (both fresh husks and mature nymphs) here in August. Oddly, I also saw one fresh husk in May at about the same elevation (~6500ft) in a different but nearby canyon stream.

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