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.

The Firehole River in Wyoming

Stream photos

Featured on the forum
Re: Trico emergers
In the Mayfly Genus Tricorythodes by Bwoklink (Martinlf replied)
Re: Trico Tips
In the Mayfly Genus Tricorythodes by Martinlf
Re: UV spectrum and trout
In General Discussion by Martinlf
Re: closing the gender gap in flyfishing
In General Discussion by Konchu (Smallflyguy replied)
Re: Fishing Kupa River, Slovenia
In Fishing Reports by Slocum (Fish1 replied)
Psychodidae True Fly LarvaPsychodidae True Fly Larva
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.
8 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.

Identification: Key to Species of Agnetina Nymphs, Couplet 2

Identification: Key to Species of Agnetina Nymphs, Couplet 2

Adapted from Stark et al (1986)
Option 1Option 2
Arms of light-colored M-shaped line on head directed essentially laterally
Figure from this Agnetina capitata nymph.
Arms of light-colored M-shaped line on head directed posterolaterally
Figure from this Agnetina flavescens nymph.
Dark pigment of tergum 10 continuous
Nymphal tergum 10 of Agnetina capitata.
Nymphal tergum 10 of Agnetina capitata. Figure source: Stark et al (1986)
Dark pigment of tergum 10 interrupted mesally
Nymphal tergum 10 of Agnetina flavescens.
Nymphal tergum 10 of Agnetina flavescens. Figure source: Stark et al (1986)
2 Example Specimens
1 Example Specimen
Agnetina flavescens (Golden Stone) Stonefly NymphAgnetina flavescens (Golden Stone) Stonefly Nymph
Dorsal view of a Agnetina flavescens (Perlidae) (Golden Stone) Stonefly Nymph from Fall Creek in New York
I took a few closeup pictures of this stonely with my old camera and a microscope.
3 Pictures
Agnetina capitata Agnetina flavescens
Adapted from Stark et al (1986)
The current couplet is highlighted with darker colors and a icon, and couplets leading to this point have a icon.
Couplet 1
Couplet 1
Leads to Agnetina annulipes:
  • Apex of tergum 10 dark
Agnetina annulipes
Leads to Couplet 2:
  • Apex of tergum 10 light
Couplet 2
Couplet 2

You are here
Couplet 2 (You are here)
Leads to Agnetina capitata:
  • Arms of light-colored M-shaped line on head directed essentially laterally
  • Dark pigment of tergum 10 continuous
Agnetina capitata
Leads to Agnetina flavescens:
  • Arms of light-colored M-shaped line on head directed posterolaterally
  • Dark pigment of tergum 10 interrupted mesally
Agnetina flavescens

Start a Discussion of this Couplet

References

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Plecoptera (Stoneflies)
  5. » Family Perlidae (Golden Stones)
  6. » Genus Agnetina (Golden Stones)
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy