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.

The "Fountain Flats" stretch of the Firehole was fishable in the morning after an uncharacteristically cold August night.

From the Firehole River in Wyoming

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

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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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Caddisfly Species Rhyacophila verrula (Green Sedges)

Where & when

Time of year : Fall

In 29 records from GBIF, adults of this species have mostly been collected during August (41%), September (34%), and October (17%).

In 29 records from GBIF, this species has been collected at elevations ranging from 131 to 10984 ft, with an average (median) of 8665 ft.

Species Range

source

Map of specific collection sites

Larva & pupa biology

Diet: Algae, aquatic plant leaves, moss

Environmental tolerance: Best in cold, spring-fed streams

Start a Discussion of Rhyacophila verrula

References

LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.