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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.

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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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Female Rhithrogena hageni (Western Black Quill) Mayfly Dun Pictures

I was surprised by the olive cast on the body of this female Rhithrogena dun, which led me to mistake it for a western green drake (Drunella) in the field. I was pleasantly surprised to get a closer look and find something I hadn't collected yet. Its species ID is based on proximity to male spinner collected on the same trip, as well as physical similarity (size, tergite coloration, dark streaks on the femora) to that specimen.

Female Rhithrogena hageni (Heptageniidae) (Western Black Quill) Mayfly Dun from Mystery Creek #249 in Washington
Female Rhithrogena hageni (Heptageniidae) (Western Black Quill) Mayfly Dun from Mystery Creek #249 in Washington
Female Rhithrogena hageni (Heptageniidae) (Western Black Quill) Mayfly Dun from Mystery Creek #249 in Washington
Dorsal view of a Female Rhithrogena hageni (Heptageniidae) (Western Black Quill) Mayfly Dun from Mystery Creek #249 in Washington
Ventral view of a Female Rhithrogena hageni (Heptageniidae) (Western Black Quill) Mayfly Dun from Mystery Creek #249 in Washington
Ruler view of a Female Rhithrogena hageni (Heptageniidae) (Western Black Quill) Mayfly Dun from Mystery Creek #249 in Washington The smallest ruler marks are 1 mm.
Lateral view of a Female Rhithrogena hageni (Heptageniidae) (Western Black Quill) Mayfly Dun from Mystery Creek #249 in Washington

This mayfly was collected from Mystery Creek #249 in Washington on July 4th, 2020 and added to Troutnut.com by Troutnut on July 12th, 2020.


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Female Rhithrogena hageni (Western Black Quill) Mayfly Dun Pictures

Collection details
Location: Mystery Creek #249, Washington
Date: July 4th, 2020
Added to site: July 12th, 2020
Author: Troutnut
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