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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.

Waterfalls over smooth bedrock above Titcomb Lakes From Titcomb Basin in Wyoming

Stream photos

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Epeorus albertae (Pink Lady) Mayfly NymphEpeorus albertae (Pink Lady) Mayfly Nymph
Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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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 Genus Paragnetina (Golden Stones)

Paragnetina media is an important species in both the East and the Midwest, and Paragnetina immarginata is important in the East.

Where & when

In 67 records from GBIF, adults of this genus have mostly been collected during June (33%), July (24%), May (21%), August (9%), and April (6%).

In 10 records from GBIF, this genus has been collected at elevations ranging from 600 to 3802 ft, with an average (median) of 1148 ft.

Genus Range
Map of specific collection sites

Identification

To determine whether a specimen of Perlidae belongs to Paragnetina, use the Key to Genera of Perlidae Nymphs.

Specimens of the Stonefly Genus Paragnetina

1 Male Adult
Male Paragnetina immarginata (Beautiful Stonefly) Stonefly Adult
9 Pictures
Lateral view of a Male Paragnetina immarginata (Perlidae) (Beautiful Stonefly) Stonefly Adult from Brodhead Creek in Pennsylvania
Added by Troutnut on June 4, 2007
Collected May 28, 2007 from Brodhead Creek in Pennsylvania and added by Troutnut on June 4, 2007
2 Female Adults
3 Nymphs

Start a Discussion of Paragnetina

Stonefly Genus Paragnetina (Golden Stones)

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Plecoptera (Stoneflies)
  5. » Family Perlidae (Golden Stones)
  6. » Genus Paragnetina (Golden Stones)
Species in Paragnetina
Paragnetina immarginataBeautiful Stoneflies
1
9
Paragnetina mediaEmbossed Stoneflies
4
27
Species in Paragnetina: Paragnetina immarginata, Paragnetina media
3 species (Paragnetina fumosa, Paragnetina ichusa, and Paragnetina kansensis) aren't included.
Genus Range
Map of specific collection sites
Common Names
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