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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

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.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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

Genus Range
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