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.

Upper Titcomb Lake

From Titcomb Basin in Wyoming

Stream photos

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Male Baetidae (Blue-Winged Olive) Mayfly Dun Male Baetidae (Blue-Winged Olive) Mayfly Dun

Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington

This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.

7 Recently Added Photos

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 Soyedina washingtoni (Tiny Winter Blacks)

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: Soyedina Ricker, 1952 (Plecoptera: Nemouridae) in the eastern Nearctic: review of species concepts, proposed morphology-based species groups, and description of a new species from North Carolina

Three species are proposed for this group: Soyedina carolinensis, Soyedina merritti, and Soyedina washingtoni. In ventral aspect the epiproct dorsal sclerite is open distally, revealing a sclerotized inner member which is flared apically, directed slightly to the left, and the flange lip is approximately the same size radially (Figs. 26 – 28, 36 – 38, 44 – 46). The paired ventral sclerites are asymmetric with right member distinctly longer than left (Figs. 25 – 26, 35 – 36, 43 – 44). The paired dorsal sclerites are also asymmetric (Figs. 29 – 30, 39 – 40, 47 – 48). The outer paraproct lobes are variable between species. This is mainly an Appalachian-distributed species group (Fig. 80).

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