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.

The Clark's Fork of the Yellowstone River in Wyoming

Stream photos

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

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.

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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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Apatania larvae and pupae

Millcreek has attached these 3 pictures. The message is below.

Millcreek
Healdsburg, CA

Posts: 344

Millcreek on Feb 17, 2016February 17th, 2016, 11:04 am EST

These were collected during the spring and summer from Mill Creek, a tributary of Dry Creek and the Russian River. They were collected from areas with a moderate flow and a gravel and cobble base. There was little filamentous algae but good growths of diatoms.

The larvae and pupae are 6-7 mm. The cases are 8 mm.

The larvae were identified using Merritt, Cummins and Berg (2008). The pupae were identified to family using the above.

"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Feb 17, 2016February 17th, 2016, 2:31 pm EST

Great photos, as usual. Thanks!

"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell

Crepuscular

Boiling Springs, PA

Posts: 920

Crepuscular on Feb 18, 2016February 18th, 2016, 3:53 am EST

Nice Matt. Interesting thing about some Apatania I seem to recall that in some places females greatly out number males and there is parthenogenesis.

PaulRoberts