Header image
Enter a name
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.

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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.

Partsman
Partsman's profile picture
bancroft michigan

Posts: 321
Partsman on Dec 23, 2020December 23rd, 2020, 12:59 pm EST
To all you troutnuts here, I'm wishing you all a very merry christmas, and lets all hope a happy and healthy new year!
Mike.
Wbranch
Wbranch's profile picture
York & Starlight PA

Posts: 2635
Wbranch on Dec 24, 2020December 24th, 2020, 10:12 am EST
Same to you and your family Mike and all the other Troutnut forum members. Merry Christmas, Happy Holidays and a less stressful New Year and 2021.
Catskill fly fisher for fifty-five years.
Troutnut
Troutnut's profile picture
Administrator
Bellevue, WA

Posts: 2758
Troutnut on Dec 29, 2020December 29th, 2020, 5:41 pm EST
Same to all of you!
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Quick Reply

Related Discussions

Topic
Replies
Last Reply
8
Jan 17, 2007
by Jlh42581
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy