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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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

5 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.

Little Yellow Quills

This common name refers to only one species. Click its scientific name to learn more.

Mayfly Species Leucrocuta hebe

These are often called Little Yellow Quills.

This widespread species produces more fishable hatches in the East and Midwest than any other species in the Heptagenia genus complex.

Female Leucrocuta hebe (Little Yellow Quill) Mayfly Dun

4 Pictures

Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Dun from the Beaverkill River in New York

I found Catskill brown trout eagerly surface feeding to this species.

Collected August 21, 2004 from the Beaverkill River in New York

Added by Troutnut on January 25, 2006

Collected August 21, 2004 from the Beaverkill River in New York and added by Troutnut on January 25, 2006

Female Leucrocuta hebe (Little Yellow Quill) Mayfly Spinner

6 Pictures

Lateral view of a Female Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Spinner from Mystery Creek #43 in New York

I found this spinner on the same piece of stream as a similar dun, probably of the same species.

Collected September 18, 2006 from Mystery Creek #43 in New York

Added by Troutnut on October 4, 2006

Collected September 18, 2006 from Mystery Creek #43 in New York and added by Troutnut on October 4, 2006

Leucrocuta hebe (Little Yellow Quill) Mayfly Nymph

4 Pictures

Dorsal view of a Leucrocuta hebe (Heptageniidae) (Little Yellow Quill) Mayfly Nymph from the Bois Brule River in Wisconsin

Collected June 8, 2005 from the Bois Brule River in Wisconsin

Added by Troutnut on May 26, 2006

Collected June 8, 2005 from the Bois Brule River in Wisconsin and added by Troutnut on May 26, 2006

See 8 more specimens...

References

Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.