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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.

Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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 palomar (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 narrow and slightly notched, knob width 13 - 17 % of segment 7 width (Figs. 15, 16). Tergum 9 with rounded knobs located near mid segment (Figs. 13 - 15). Epiproct in dorsal view narrow and linear, maximum width 13 - 15 % of epiproct length; maximum width occurs posterior of mid epiproct; apex wedge-shaped or narrowly rounded; dorsal membrane light colored and confined to a small area between the epiproct apex and dorsolateral horn tips; dorsal median groove extends full epiproct length (Figs. 13 - 15). Epiproct in lateral view generally linear, with slight reverse curve dorsally and shallow keel ventrally; maximum depth 12 - 14 % of length; maximum depth occurs anterior of mid epiproct; neck narrow (Figs. 14, 15). Epiproct dorsolateral horns appressed to main dorsal surface; horn length 15 - 17 % of epiproct length; horn tips extend forward to 92 - 95 % of epiproct length (Figs. 13 - 15; Table 1).

Female. Subgenital plate heavily sclerotized and dark, covering most of sternum 8 and extending onto sternum 7 (Fig. 237, Nelson and Baumann 1989).

Start a Discussion of Sierracapnia palomar

Stonefly Species Sierracapnia palomar (Little Snowflies)

Species Range
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