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.

Here Oksrukuyik Creek flows away from the Dalton Highway toward the pipeline. It eventually grows into one of the major rivers of the North Slope, and the main drainage to the west of the Sag, but where it crosses the road it's just a small grayling stream.

From Oksrukuyik Creek in Alaska

Stream photos

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington

I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.

11 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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Mayfly Genus Timpanoga

This genus contains two subspecies that create localized fishable hatches throughout the West. Timpanoga hecuba hecuba can be important east of the Cascades and Sierra Nevada Mountains. Timpanoga hecuba pacifica can be important on the Coast, as its name implies.

Where & when

In 6 records from GBIF, adults of this genus have been collected during September (50%), August (33%), and July (17%).

In 12 records from GBIF, this genus has been collected at elevations ranging from 4741 to 9360 ft, with an average (median) of 5269 ft.

Genus Range

source

Map of specific collection sites

Specimens of the Mayfly Genus Timpanoga

1 Female Dun

Female Timpanoga hecuba (Great Red Quill) Mayfly Dun

3 Pictures

Female Timpanoga hecuba (Ephemerellidae) (Great Red Quill) Mayfly Dun from Mystery Creek #178 in Idaho

This specimen is 14 mm. Technically this is the subspecies T. h. hecuba. The Cascades, Sierras and further West is where the other subspecies, T. h. pacifica is found. The Great Basin seems to have formed a barrier preventing any overlap in their distribution.

Collected September 14, 2013 from Mystery Creek #178 in Idaho

Added by Entoman on September 22, 2013

Collected September 14, 2013 from Mystery Creek #178 in Idaho and added by Entoman on September 22, 2013