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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.

Stream photos

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Amphizoa Beetle LarvaAmphizoa Beetle Larva
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).
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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 Species Acroneuria abnormis (Golden Stones)

Where & when

In 64 records from GBIF, adults of this species have mostly been collected during June (45%), July (27%), and May (22%).

In 48 records from GBIF, this species has been collected at elevations ranging from 20 to 10663 ft, with an average (median) of 1743 ft.

Species Range
Map of specific collection sites

Specimens of the Stonefly Species Acroneuria abnormis

3 Nymphs

Start a Discussion of Acroneuria abnormis

References

Stonefly Species Acroneuria abnormis (Golden Stones)

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Plecoptera (Stoneflies)
  5. » Family Perlidae (Golden Stones)
  6. » Genus Acroneuria (Golden Stones)
  7. » Species abnormis (Golden Stones)
Species Range
Map of specific collection sites
Common Names
Resources
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