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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana
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.
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Stonefly Species Sierracapnia mono (Little Snowflies)

Species Range

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.

Source: Sierracapnia, A New Genus Of Capniidae (Plecoptera) From Western North America

Male. Tergum 7 knob wide and usually divided into two lobes, knob width 30 - 40 % of segment 7 width (Figs. 9, 11). Epiproct in dorsal view with sinuous lateral edges, maximum width 16 - 23 % of epiproct length (Fig. 9); maximum width occurs near mid epiproct; apex narrow and pointed; posterior third of epiproct with narrow ventrolateral flange; dorsal membrane light colored. Epiproct in lateral view slightly convex dorsally, deeply keeled ventrally; maximum depth 32 - 35 % of length; maximum depth occurs anterior of mid epiproct; neck thick (Fig. 10). Epiproct dorsolateral horns closely appressed to main dorsal surface; horn length 16 - 20 % epiproct length; horn tips extend forward to 67 - 75 % epiproct length (Figs. 9, 10; Table 1).

Female. Subgenital plate heavily sclerotized and dark; plate covers entire width of sternum 8 from posterior to anterior edge; sclerotization extends onto sternum 7 (Fig. 232, Nelson and Baumann 1989).

Start a Discussion of Sierracapnia mono

Stonefly Species Sierracapnia mono (Little Snowflies)

Species Range
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