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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

The Mystery Creek # 294 in Wyoming

Stream photos

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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

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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)
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