Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Inlet of Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Doroneuria baumanni (Golden Stone) Stonefly Nymph Doroneuria baumanni (Golden Stone) Stonefly Nymph

Dorsal view of a Doroneuria baumanni (Perlidae) (Golden Stone) Stonefly Nymph from Sears Creek in Washington

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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 Nemocapnia carolina (Little Snowflies)

Species Range

source

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: The Winter Stoneflies (Plecoptera: Capniidae) Of Mississippi

Male epiproct. Epiproct a single, slender, cylindrical, probe, bearing an apical orifice (Figs. 52, 55); dorsal surface relatively smooth but bearing a prominent suture; epiproct carried in an upright position in most specimens (Fig. 54). Male tergal process. Abdominal tergum 8 without process, but tergum 9 bears a low knob lateral to epiproct on either side of segment (Figs. 53, 55 - 57).

Female subgenital plate. Abdominal sterna 7 and 8 completely separated by membrane. Mesal portion of sternum 8 divided into a large, somewhat mushroom shaped anterior sclerite and a narrow, transverse posterior sclerite (Figs. 58, 66). Source: Records Of An Uncommon Stonefly, Nemocapnia Carolina Banks (Plecoptera: Capniidae), In South Carolina And Nearby States

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