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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.

Case view of a Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
It's only barely visible in one of my pictures, but I confirmed under the microscope that this one has a prosternal horn and the antennae are mid-way between the eyes and front of the head capsule.

I'm calling this one Pycnopsyche, but it's a bit perplexing. It seems to key definitively to at least Couplet 8 of the Key to Genera of Limnephilidae Larvae. That narrows it down to three genera, and the case seems wrong for the other two. The case looks right for Pycnopsyche, and it fits one of the key characteristics: "Abdominal sternum II without chloride epithelium and abdominal segment IX with only single seta on each side of dorsal sclerite." However, the characteristic "metanotal sa1 sclerites not fused, although often contiguous" does not seem to fit well. Those sclerites sure look fused to me, although I can make out a thin groove in the touching halves in the anterior half under the microscope. Perhaps this is a regional variation.

The only species of Pycnopsyche documented in Washington state is Pycnopsyche guttifera, and the colors and markings around the head of this specimen seem to match very well a specimen of that species from Massachusetts on Bugguide. So I am placing it in that species for now.

Whatever species this is, I photographed another specimen of seemingly the same species from the same spot a couple months later.
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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This discussion is about Swamp Creek.

Habitat of Cinygma nymphs collected this date. Nymphs were mature along with two Ameletus species and Drunella spinifera and some caddisflies.

From Swamp Creek in Oregon
Jmd123's profile picture
Oscoda, MI

Posts: 2474
Jmd123 on Jul 15, 2011July 15th, 2011, 3:08 pm EDT
Ah yes, Oregon! I lived there (Coos Bay area) back in '92-'93, and actually did aquatic entomology there (though not to the species level - I had a LOT of streams to cover in a few month period). Yet I look at this photo and it sure reminds me of some of the little streams around my new home in northern lower Michigan...brookie waters! Out there...cutthroats? The little creeks I sampled at the South Slough National Estuarine Research Reserve held many sea-run cutt and coho parr...oh, the memories. I think I left a little piece of my heart and soul out there - I have to go find them again one of these days. Well, the boss is talking about sending me out there for some work projects...

No matter how big the one you just caught is, there's always a bigger one out there somewhere...

Posts: 1
Agtabrentwi on Oct 24, 2011October 24th, 2011, 10:45 pm EDT
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