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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 Ephemerella mucronata (Ephemerellidae) Mayfly Nymph from the Yakima River in Washington
This is an interesting one. Following the keys in Merritt R.W., Cummins, K.W., and Berg, M.B. (2019) and Jacobus et al. (2014), it keys clearly to Ephemerella. Jacobus et al provide a key to species, but some of the characteristics are tricky to interpret without illustrations. If I didn't make any mistakes, this one keys to Ephemerella mucronata, which has not previously been reported any closer to here than Montana and Alberta. The main character seems to fit well: "Abdominal terga with prominent, paired, subparallel, spiculate ridges." Several illustrations or descriptions of this holarctic species from the US and Europe seem to match, including the body length, tarsal claws and denticles, labial palp, and gill shapes. These sources include including Richard Allen's original description of this species in North America under the now-defunct name E. moffatae in Allen RK (1977) and the figures in this description of the species in Italy.
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.

Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Jun 5, 2010June 5th, 2010, 4:30 pm EDT
I'm going to be doing a bit of work on the site -- just back-end stuff that probably won't affect what users see. It's related to the little fiasco we had a couple weeks ago with the site being flat-out messed up.

Basically, I'm having my host copy the site onto new servers (which messes it up), then fixing it there and pointing the "troutnut.com" domain name to the fixed site on the new servers. That means any forum posts that take place in the next few days or so might be lost in the process... so if you were planning to post your greatest manifesto on exactly how to catch all the pickiest trout, you might want to hold off for a bit.

I'll update this again as soon as everything's settled back to normal.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
Taxon
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Site Editor
Plano, TX

Posts: 1311
Taxon on Jun 5, 2010June 5th, 2010, 9:16 pm EDT
Thanks for the heads up, Jason.

Best regards,
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com

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