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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.

Artistic view of a Perlodidae (Springflies and Yellow Stones) Stonefly Nymph from the Yakima River in Washington
This one seems to lead to Couplet 35 of the Key to Genera of Perlodidae Nymphs and the genus Isoperla, but I'm skeptical that's correct based on the general look. I need to get it under the microscope to review several choices in the key, and it'll probably end up a different Perlodidae.
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.

Ameletus (Brown Dun) Mayfly Nymph Pictures

Ventral view of a Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Dorsal view of a Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington
Ruler view of a Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington The smallest ruler marks are 1 mm.
Lateral view of a Ameletus (Ameletidae) (Brown Dun) Mayfly Nymph from the South Fork Snoqualmie River in Washington

This mayfly was collected from the South Fork Snoqualmie River in Washington on June 13th, 2019 and added to Troutnut.com by Troutnut on June 14th, 2019.

Discussions of this Nymph

Siphlonurus sp.
1 replies
Posted by Millcreek on Jan 27, 2020
Last reply on Feb 2, 2020 by Troutnut
This looks more like an Ameletus species than a Siphlonurus species. At any rate it isn't Siphlonurus because it dosen't have double gills on any segments.

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Ameletus (Brown Dun) Mayfly Nymph Pictures

Collection details
Location: South Fork Snoqualmie River, Washington
Date: June 13th, 2019
Added to site: June 14th, 2019
Author: Troutnut
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