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.

The Middle Fork of the Koyukuk River in Alaska

Stream photos

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

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.

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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.

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Stonefly Species Isoperla burksi (Yellow Sallies)

Species Range

source

Identification

Species ID from GBIFthe Global Biodiversity Information Facility

Source: Taxonomic Notes On The Eggs Of Eastern Nearctic Isoperla (Plecoptera: Perlodidae: Isoperlinae)

Diagnosis. Szczytko & Kondratieff (2015) placed this species in the Isoperla burksi group with Isoperla cotta Ricker, 1952 and Isoperla orata Frison, 1942. Egg characteristics uniting these species include a concave cross-section, well-developed collar, distinct ridges off-setting the cell impressions, and lack of an eclosion line (Szczytko & Kondratieff 2015). Eggs of Isoperla burksi from Indiana and Kentucky, however, possess a distinct eclosion line (Figs. 4 - 6) that easily distinguishes this species from Isoperla cotta (Szczytko & Kondratieff 2015, figs. 10.14, 10.18) and Isoperla orata (Szczytko & Kondratieff 2015, figs. 37.9, 37.12). Each of the other three characteristics listed above are exhibited by Isoperla burksi.

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Description from GBIFthe Global Biodiversity Information Facility

Source: Taxonomic Notes On The Eggs Of Eastern Nearctic Isoperla (Plecoptera: Perlodidae: Isoperlinae)

(Figs. 1 - 6) http: // lsid. speciesfile. org / urn: lsid: Plecoptera. speciesfile. org: TaxonName: 468714Source: Taxonomic Notes On The Eggs Of Eastern Nearctic Isoperla (Plecoptera: Perlodidae: Isoperlinae)

Egg. General shape oblong, cross-section concave (Figs. 1 - 2), anterior and posterior poles broadly-rounded (Figs. 2 - 4). Color pale brown. Collar well-developed, with irregular longitudinal ridges, slightly flared apically (Fig. 3). Follicle cell impressions near collar ranging from elongate to hexagonal (Figs. 1, 3). Chorion covered mostly with irregular-shaped pentagonal or hexagonal follicle cell impressions with thickened elevated ridges (Figs. 4 - 6); floors with numerous shallow pits (Fig. 5 - 6). Eclosion line present (Figs. 4 - 6). Micropyles located along ridges near eclosion line in anterior ¼ (Figs. 5 - 6).

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