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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 Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
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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Pseudo-Microcaddisflies

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

Caddisfly Genus Protoptila

These are often called Pseudo-Microcaddisflies.
These very tiny caddisflies (hook size 24-28) are not very important to anglers, because of both their size and the fact that they prefer warmer water. On rare occasions they are abundant enough to be significant.

None of the books I've checked suggest which individual species are important.

Pseudo-Microcaddisflies

Scientific Name
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