Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin

Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Stream photos

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Limnephilidae (Giant Sedges) Caddisfly Larva Limnephilidae (Giant Sedges) Caddisfly Larva

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington

This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.

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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 Zealeuctra narfi (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: A review of the Nearctic genus Zealeuctra Ricker (Plecoptera, Leuctridae), with the description of a new species from the Cumberland Plateau region of eastern North America

Male - abdominal tergal cleft. Anterior portion U-shaped and tapering slightly to a broadly-rounded anterior terminus (Fig. 6 A). Posterior portion markedly narrower than anterior portion, with a pair of medially-projected processes (Figs 6 A-B), the terminal projection larger, subtruncate, and thumb-like, the subterminal projection smaller and subtriangular. Male - epiproct. Base broad and slightly-directed posterodorsally, tip of spine directed abruptly and anteriorly at ca. 90 ° angle from base, tapering and gently recurved anteriorly (Figs 6 B-C). No accessory spine or cusp present.

Female - 7 th sternum. Seventh sternum with a broadly-subquadrate lobe nested in a scarcely-convex central notch (Fig. 6 D). Posterior margins essentially straight.

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