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.

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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Stonefly?

Pdcox has attached these 2 pictures to aid in identification. The message is below.

Pdcox
Kansas city

Posts: 12

Pdcox on Oct 30, 2019October 30th, 2019, 4:07 am EDT

Hi, just a rookie here. Found this bug in a mountain freestone stream central Colorado. Curious about the fed/orange bands around body. Any help in ID?
Thanks

Creno
Grants Pass, OR

Posts: 302

Creno on Oct 30, 2019October 30th, 2019, 6:29 am EDT

the red spots look like mites. Fairly common on aquatic insects

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Oct 30, 2019October 30th, 2019, 7:39 am EDT

Hi Paul-

I believe the stonefly nymph you found in a central Colorado stream to be of family Perlodidae. With regard to what you describe as the orange bands, I suspect that to be a parasitic infestation of orange-colored water mites.

Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

Pdcox
Kansas city

Posts: 12

Pdcox on Oct 30, 2019October 30th, 2019, 9:26 am EDT

thank you

Pdcox
Kansas city

Posts: 12

Pdcox on Oct 30, 2019October 30th, 2019, 9:27 am EDT

thanks

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Nov 19, 2019November 19th, 2019, 1:55 pm EST

I suspect that to be a parasitic infestation of orange-colored water mites.

Yikes!!

Hey Roger, how the heck are you? Well, I hope.

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

--Fred Chappell

Jmd123

Oscoda, MI

Posts: 2474

Jmd123 on Nov 20, 2019November 20th, 2019, 6:09 am EST

I can see 'em...would you all believe I have seen the red mites on water scorpions? As in Ranatra fusca, which looks for all the world like an aquatic preying mantis...

Jonathon

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

Martinlf

Moderator
Palmyra PA

Posts: 3047

Martinlf on Nov 20, 2019November 20th, 2019, 4:33 pm EST

Had to look that one up. Cool.

https://www.psychoticnature.com/photo/2667-brown_waterscorpion-ranatra_fusca

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

--Fred Chappell

Taxon

Site Editor
Plano, TX

Posts: 1311

Taxon on Dec 5, 2019December 5th, 2019, 6:57 am EST