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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Slough Creek in Wyoming

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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Male Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly Nymph Pictures

Another nymph probably of the same species as this one emerged and was photographed as a dun and partly-molted spinner.

Ruler view of a Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington The smallest ruler marks are 1 mm.
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Dorsal view of a Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Ventral view of a Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington
Male Acentrella insignificans (Baetidae) (Tiny Blue-Winged Olive) Mayfly Nymph from the Yakima River in Washington

This mayfly was collected from the Yakima River in Washington on September 12th, 2020 and added to Troutnut.com by Troutnut on September 19th, 2020.


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References

Male Acentrella insignificans (Tiny Blue-Winged Olive) Mayfly Nymph Pictures

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Ephemeroptera (Mayflies)
  5. » Family Baetidae (Blue-Winged Olives)
  6. » Genus Acentrella (Tiny Blue-Winged Olives)
  7. » Species insignificans (Tiny Blue-Winged Olives)
Collection details
Location: Yakima River, Washington
Date: September 12th, 2020
Added to site: September 19th, 2020
Author: Troutnut
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