Salmonflies
Pteronarcys californica

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

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Mayfly Species Epeorus grandis

Where & when

Time of year : June through early August

Preferred waters: Small streams

Altitude: Above 5,000 feet

Nymph biology

Current speed: Fast

Environmental tolerance: Requires very cold streams

Specimens of the Mayfly Species Epeorus grandis

3 Nymphs

Epeorus grandis Mayfly Nymph

11 Pictures

Collected March 19, 2019 from the South Fork Snoqualmie River in Washington

Added by Troutnut on June 14, 2019

Epeorus grandis Mayfly Nymph

6 Pictures

Collected June 3, 2022 from Chatter Creek in Washington

Added by Troutnut on June 4, 2022

Epeorus grandis Mayfly Nymph

3 Pictures

Collected April 8, 2005 from Yellow Bay Creek in Montana

Added by Bnewell on June 27, 2011

Comment on Epeorus grandis:

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References

Arbona, Fred Jr. 1989. Mayflies, the Angler, and the Trout. Nick Lyons Books.
Swisher, Doug and Carl Richards. 2000. Selective Trout. The Lyons Press.

Taxonomy

Kingdom Animalia (Animals)

» Phylum Arthropoda (Arthropods)

» Class Insecta (Insects)

» Order Ephemeroptera (Mayflies)

» Family Heptageniidae (March Browns, Cahills, Quill Gordons)

» Genus Epeorus (Little Maryatts)

» Species grandis

Species Range

source

Resources

NatureServe
ITIS
Described by McDunnough (1924)

SalmonfliesPteronarcys californica

Mayfly Species Epeorus grandis

Where & when

Nymph biology

Specimens of the Mayfly Species Epeorus grandis

3 Nymphs

Comment on Epeorus grandis:

References

Taxonomy

Species Range

Resources

Register

Salmonflies
Pteronarcys californica