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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

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 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).
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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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

Specimens of the Stonefly Genus Strophopteryx

2 Male Adults
2 Female Adults
1 Nymph

Start a Discussion of Strophopteryx


Stonefly Genus Strophopteryx (Early Brown Stoneflies)

4 species (Strophopteryx arkansae, Strophopteryx cucullata, Strophopteryx inaya, and Strophopteryx limata) aren't included.
Genus Range
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