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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.

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.
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 Genus Diphetor (Blue-Winged Olives)

The only species of this genus, Diphetor hageni, is one of the most important in the Baetidae family for western anglers. It was previously known as Baetis parvus in the West and its synonymy Baetis devinctus in the East.

Where & when

In 14 records from GBIF, adults of this genus have been collected during June (29%), April (29%), July (14%), August (14%), December (7%), and May (7%).

In 8 records from GBIF, this genus has been collected at elevations ranging from 700 to 8871 ft, with an average (median) of 5420 ft.

Genus Range

Specimens of the Mayfly Genus Diphetor

1 Nymph

Start a Discussion of Diphetor

Mayfly Genus Diphetor (Blue-Winged Olives)

Taxonomy
Species in Diphetor: Diphetor hageni
Genus Range
Common Name
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