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.

Stream photos

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Coleoptera (Beetle) Insect Larva Coleoptera (Beetle) Insect Larva

Lateral view of a Coleoptera (Beetle) Insect Larva from Sears Creek in Washington

6 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