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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.

I spent more than an hour casting to several rising trout in this pool and caught only two. Its clear water and tricky currents harbor dozens of free-rising, usually very hard-to-catch fish. From Enfield Creek in New York

Stream photos

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Kogotus Stonefly NymphKogotus Stonefly Nymph
Dorsal view of a Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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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Stonefly Genus Taeniopteryx (Early Black Stoneflies)

Several species of early black stoneflies may be important, but Taeniopteryx nivalis is the most common.

Where & when

In 254 records from GBIF, adults of this genus have mostly been collected during March (35%), February (24%), January (20%), April (12%), and December (6%).

In 24 records from GBIF, this genus has been collected at elevations ranging from 180 to 11430 ft, with an average (median) of 2756 ft.

Genus Range
Map of specific collection sites

Specimens of the Stonefly Genus Taeniopteryx

5 Nymphs

Start a Discussion of Taeniopteryx

References

Stonefly Genus Taeniopteryx (Early Black Stoneflies)

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Plecoptera (Stoneflies)
  5. » Family Taeniopterygidae (Willowflies)
  6. » Genus Taeniopteryx (Early Black Stoneflies)
Species in Taeniopteryx
Taeniopteryx nivalisBoreal Willowflies
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Species in Taeniopteryx: Taeniopteryx nivalis
10 species (Taeniopteryx burksi, Taeniopteryx lita, Taeniopteryx lonicera, Taeniopteryx maura, Taeniopteryx metequi, Taeniopteryx nelsoni, Taeniopteryx parvula, Taeniopteryx robinae, Taeniopteryx starki, and Taeniopteryx ugola) aren't included.
Genus Range
Map of specific collection sites
Common Names
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