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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.

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.
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

Specimens of the Mayfly Genus Timpanoga

1 Female Dun
2 Nymphs

Start a Discussion of Timpanoga

Mayfly Genus Timpanoga

Taxonomy
Genus Range
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