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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.

Dorsal view of a Limnephilidae (Giant Sedges) Caddisfly Larva from the Yakima River in Washington
This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
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 Genus Leucotrichia (Ring Horn Microcaddisflies)

See Leucotrichia pictipes for details. It is the only important species of this genus in our trout streams.

Where & when

In 40 records from GBIF, adults of this genus have mostly been collected during June (38%), July (23%), May (13%), August (13%), and April (8%).

In 27 records from GBIF, this genus has been collected at elevations ranging from 308 to 6726 ft, with an average (median) of 3035 ft.

Genus Range

2 Underwater Pictures of Leucotrichia Caddisflies:

Discussions of Leucotrichia


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References

Caddisfly Genus Leucotrichia (Ring Horn Microcaddisflies)

Taxonomy
Genus Range
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