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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Sweltsa (Sallfly) Stonefly Nymph Sweltsa (Sallfly) Stonefly Nymph

Dorsal view of a Sweltsa (Chloroperlidae) (Sallfly) Stonefly Nymph from the Yakima River in Washington

This species was fairly abundant in a February sample of the upper Yakima.

10 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.

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.

Stonefly Genus Strophopteryx (Early Brown Stoneflies)

Strophopteryx fasciata is the most important species of Early Brown Stoneflies.

Where & when

In 80 records from GBIF, adults of this genus have mostly been collected during March (38%), February (29%), April (14%), and January (13%).

In 14 records from GBIF, this genus has been collected at elevations ranging from 20 to 2723 ft, with an average (median) of 673 ft.

Genus Range

source

Map of specific collection sites

Specimens of the Stonefly Genus Strophopteryx

2 Male Adults

Male Strophopteryx fasciata (Mottled Willowfly) Stonefly Adult

4 Pictures

Dorsal view of a Male Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Adult from the Namekagon River in Wisconsin

Collected March 17, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected March 17, 2004 from the Namekagon River in Wisconsin and added by Troutnut on January 25, 2006

Male Strophopteryx fasciata (Mottled Willowfly) Stonefly Adult

2 Pictures

Ruler view of a Male Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Adult from the Namekagon River in Wisconsin The smallest ruler marks are 1/32".

This male died overnight before I had the chance to photograph him, so his abdomen is shorter than it should be because it shriveled a bit.

Collected March 15, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected March 15, 2004 from the Namekagon River in Wisconsin and added by Troutnut on January 25, 2006

2 Female Adults

Female Strophopteryx fasciata (Mottled Willowfly) Stonefly Adult

4 Pictures

Dorsal view of a Female Strophopteryx fasciata (Taeniopterygidae) (Mottled Willowfly) Stonefly Adult from the Namekagon River in Wisconsin

Several stoneflies of this species were the first adult insects I found in 2004 when I started this site. The hatch was sparse but lasted a good part of the day, and I noted a few good rises despite the early season cold. They ended up struggling on the water's surface fairly often.

Collected March 15, 2004 from the Namekagon River in Wisconsin

Added by Troutnut on January 25, 2006

Collected March 15, 2004 from the Namekagon River in Wisconsin and added by Troutnut on January 25, 2006

Female Strophopteryx fasciata (Mottled Willowfly) Stonefly Adult

5 Pictures