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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.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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.

Heptagenia pulla (Golden Dun) Mayfly Nymph Pictures

Like most Alaskan mayflies, this one is tricky to identify to the species level. See the discussion section for an informative chat about this one's ID. The current leaning is to call it a fairly immature Heptagenia pulla nymph, but a case has been made for Heptagenia elegantula as well.

Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska
Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska
Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska
Dorsal view of a Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska
Ventral view of a Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska
Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska
Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska
Ruler view of a Heptagenia pulla (Heptageniidae) (Golden Dun) Mayfly Nymph from Nome Creek in Alaska The smallest ruler marks are 1 mm.

This mayfly was collected from Nome Creek in Alaska on July 10th, 2011 and added to Troutnut.com by Troutnut on July 13th, 2011.

Discussions of this Nymph

Heptageniid Nymph
42 replies
Posted by Entoman on Jul 13, 2011
Last reply on Jul 25, 2011 by Oldredbarn
Hi Jason,

Looks like an immature Heptagenia elegantula to me.

regards,

Kurt

Start a Discussion of Nymph

Heptagenia pulla (Golden Dun) Mayfly Nymph Pictures

Collection details
Location: Nome Creek, Alaska
Date: July 10th, 2011
Added to site: July 13th, 2011
Author: Troutnut
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