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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

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.

11 Recently Added Photos

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.

Mayfly Central Update

Konchu

Site Editor
Indiana

Posts: 498

Konchu on Jul 10, 2013July 10th, 2013, 12:09 pm EDT

My first update as steward of Mayfly Central is now online. In addition to the usual emendations associated with new species, new synonyms and new distribution data, I corrected a longtime misuse of parentheses involved with generic recombinations. This was tedious, so mistakes are likely. Please check for errors or omissions, particularly on the species list pages, and let me know by email or PM.

Creno
Grants Pass, OR

Posts: 302

Creno on Jul 10, 2013July 10th, 2013, 1:58 pm EDT

Thanks Luke! that is a major undertaking and I am glad to hear it is in good hands for a few more years.

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Jul 10, 2013July 10th, 2013, 8:46 pm EDT

That's really great, Luke. Makes me proud to know ya. :-) Will PM you if I should catch something while incorporating your Mayfly Central updates into screens on my website.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Adirman