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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.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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.

Millcreek has attached these 6 pictures to aid in identification. The message is below.
Larvae are 10 mm. Cases 11 mm.
Larvae are 10 mm. Cases 11 mm.
Larvae are 10 mm.
Larvae are 10 mm. Cases 11 mm.
Larvae are 10 mm.
Larvae are 10 mm.
Healdsburg, CA

Posts: 344
Millcreek on Feb 16, 2015February 16th, 2015, 6:22 am EST
This larvae is common to Mill Creek, a tributary of the Russian River. Haven't found it in the river yet, but it's seasonally common in the stream. Keyed it out to genus in Merritt, Cummins and Berg (2008). Curious as to species. Any help would be appreciated.
"If we knew what it was we were doing, it would not be called research, would it?"
-Albert Einstein
PaulRoberts's profile picture

Posts: 1776
PaulRoberts on Feb 16, 2015February 16th, 2015, 1:59 pm EST
Pretty thing.
Gutcutter's profile picture

Posts: 470
Gutcutter on Feb 17, 2015February 17th, 2015, 3:26 am EST
Does anybody know how they make that type of case?
Very cool.
Some amazing engineering.
All men who fish may in turn be divided into two parts: those who fish for trout and those who don't. Trout fishermen are a race apart: they are a dedicated crew- indolent, improvident, and quietly mad.

-Robert Traver, Trout Madness
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Feb 17, 2015February 17th, 2015, 6:14 am EST
Hi Tony-

Does anybody know how they make that type of case?

Caddisfly larvae use a mouthpart gland which extrudes silk as a binding agent to build their cases.
Best regards,
Roger Rohrbeck
Grants Pass, OR

Posts: 302
Creno on Feb 17, 2015February 17th, 2015, 7:43 am EST
Gumaga is a great taxa to initiate a discussion of the species concept. There are numerous publications from the Resh Lab involving Gumaga "species". (http://nature.berkeley.edu/reshlab/) Ya probably should start with Jackson and Resh 1998. (Jackson, John K., Resh, Vincent H. 1998. Morphologically cryptic species confound ecological studies of the caddisfly genus Gumaga (Trichoptera: Sericostomatidae) in northern California. Aquatic Insects 20: 69-84.)

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