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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.

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.

Female Siphlonurus autumnalis (Gray Drake) Mayfly Spinner Pictures

I found this specimen and saw a few more of its kind during midday on a small, steep, rocky creek fairly high in the Cascades, different from the previously reported habitats of its species.

Appears to be Siphlonurus autumnalis

Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington
Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington
Lateral view of a Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington
Dorsal view of a Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington
Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington
Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington
Ventral view of a Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington
Ruler view of a Female Siphlonurus autumnalis (Siphlonuridae) (Gray Drake) Mayfly Spinner from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.

This mayfly was collected from Mystery Creek #249 in Washington on September 29th, 2020 and added to Troutnut.com by Troutnut on November 10th, 2020.


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Female Siphlonurus autumnalis (Gray Drake) Mayfly Spinner Pictures

Collection details
Location: Mystery Creek #249, Washington
Date: September 29th, 2020
Added to site: November 10th, 2020
Author: Troutnut
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