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Quick evening on the upper Yakima



By Troutnut on September 17th, 2020
With smoke from the west coast wildfires beginning to clear just a little, I took a few hours to fish one of the nearest access points on the Yakima River, where the fish are small and the water uncrowded. There were some stoneflies and caddisflies in the air--I collected one of each, representing the most abundant species--but there weren't enough bugs on the water to get the fish rising, except for the abundant 3-inch-long Chinook Salmon parr. I continued playing around with my new Euro nymphing rig and landed several rainbows up to 12", including my first double on that rod.

Photos by Troutnut from the Yakima River in Washington

 From the Yakima River in Washington.
LocationYakima River
Date TakenSep 17, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Yakima River in Washington.
LocationYakima River
Date TakenSep 17, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Yakima River in Washington.
LocationYakima River
Date TakenSep 17, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Yakima River in Washington.
LocationYakima River
Date TakenSep 17, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1
 From the Yakima River in Washington.
LocationYakima River
Date TakenSep 17, 2020
Date AddedSep 18, 2020
AuthorTroutnut
CameraNIKON 1 AW1

Closeup insects by Troutnut from the Yakima River in Washington

Male Onocosmoecus unicolor (Great Late-Summer Sedge) Caddisfly AdultMale Onocosmoecus unicolor (Great Late-Summer Sedge) Caddisfly Adult View 15 PicturesI first just assumed this was Dicosmoecus based on anglers' conventional wisdom since it's a large orange "October caddis," but Creno set me straight. I should have keyed it out. After another look under the microscope, it lacks an anepisternal wart on the mesopleuron (Mesopleuron: The side of the insect mesothorax, and the part to which the fore wings are attached in mayflies.), which rules out Dicosmoecus. The midtibiae have 2 apical (Apical: Close to the apex; tip or end.) spurs and 1 pre-apical (Apical: Close to the apex; tip or end.) spur, and from there the color pattern of the wing points to Onocosmoecus. The location then narrows the species to unicolor.
Collected September 17, 2020 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020
Female Plecoptera (Stoneflies) Stonefly AdultFemale Plecoptera (Stoneflies) Insect Adult View 9 PicturesI'm puzzled on the family ID on this one. Just going by the size, shape, and color, it looks like Chloroperlidae. However, the key in Merritt & Commins has me puzzled. the second anal vein of the forewing is does not appear to be forked, and the apical (Apical: Close to the apex; tip or end.) tmaxillary palpal segment is about 60 % of the length of the penultimate segment, which does not strike me as "greatly reduced." If we assume it's not Chloroperlidae and move beyond there in the key, we get to the position of the cubitoanal crossvein (Crossvein: Short cross-wise veins in an insect wing which connect the long longitudinal (length-wise) veins.) relative to the anal cell in the forewing -- touching it in this case, which would indicate Perlidae. But the size and relatively skinny, cylindrical body really don't seem to match Perlidae at all.

If we assume it actually is Chloroperlidae and advance to couplet 92 (at least in the 5th edition key), we end up with one feature (vein Cu2 well developed with several intercubital crossveins (Crossvein: Short cross-wise veins in an insect wing which connect the long longitudinal (length-wise) veins.) connecting Cu1 and Cu2) contradicting two others (posterolateral margins of head usually parallel behind eyes, and epicranial sutures prominent) in the first couplet.

I'm clearly missing something.
Collected September 17, 2020 from the Yakima River in Washington
Added to Troutnut.com by Troutnut on September 19, 2020

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