Header image
Enter a name
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.

Dorsal view of a Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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.
Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Mayfly Species Rhithrogena uhari

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.

Female Spinner

Body length: 6 mm
Wing length: 7 mm

A small pale species.

Female imago pale yellowish. A black mark below antenna; faint brownish markings above frontal margin; base of antenna white; basal portion of filament dark, remainder light brown. Thoracic notum yellowish; metanotum yellow-brown, darker posteriorly. Small dark spot near center of lateral margin of pronotum. Faint purplish shading near wing bases; brown shading on each side of scutellum. Pleura paler than notum; purplish marks below wing roots; faint dark lines above bases of middle and hind legs. Sternum pale, mesosternum yellow. Legs pale whitish. Small round black spot at center of each femur. Tarsi smoky, with black spot dorsally at each joining. Wings semi-hyaline whitish, with faint milky tinge. Opaque cloud in stigmatic area. Venation whitish. Abdominal tergites light yellowish brown; 1-5 with purplish posterior margins; 6-10 more yellow, unbanded. Pleural fold whitish. Sternites pale yellow, immaculate. Tails pale yellow, joinings opaque. Female very similar to Rhithrogena exilis and R. fuscifrons; abdominal tergites rather darker than in the former, general color paler than the latter.


Start a Discussion of Rhithrogena uhari

References

  • Needham, James G., Jay R. Traver, and Yin-Chi Hsu. 1935. The Biology of Mayflies. Comstock Publishing Company, Inc.

Mayfly Species Rhithrogena uhari

Species Range
Troutnut.com is copyright © 2004-2024 (email Jason). privacy policy