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.

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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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Unidentified Mayfly Kansas City, MO

Pdcox has attached this picture to aid in identification. The message is below.

Pdcox
Kansas city

Posts: 12

Pdcox on Apr 15, 2020April 15th, 2020, 5:11 am EDT

Well this guy about blew my mind. No idea mayflies were in man made lakes. This bug was about 3/4 inch body length. Found yesterday, James Reed Park, cloudy, windy, 48 degrees. I have enhanced the green of the eyeballs a bit in Photoshop so they stand out, but could definitely see the color au natural.
Any help appreciated

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Apr 15, 2020April 15th, 2020, 9:10 am EDT

Hi Paul-

I believe this female subimago to be Stenonema femoratum.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Pdcox
Kansas city

Posts: 12

Pdcox on Apr 15, 2020April 15th, 2020, 9:28 am EDT

Thank you sir

Pdcox
Kansas city

Posts: 12

Pdcox on Apr 16, 2020April 16th, 2020, 2:25 am EDT

Also, what clued you in to this being female?

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Apr 16, 2020April 16th, 2020, 5:24 am EDT

The clues to it being a female were the absence of male claspers sticking out beyond the abdomen, in combination with the smaller compound eyes characteristic of a female.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com