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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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Lateral view of a Drunella grandis (Ephemerellidae) (Western Green Drake) Mayfly Nymph from the Dosewallips River in Washington
Martinlf
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Palmyra PA

Posts: 3047
Martinlf on Aug 14, 2020August 14th, 2020, 3:30 am EDT
Love the detail here, Jason. Those spikes on the head and abdomen are cool. Horned mayfly.
"He spread them a yard and a half. 'And every one that got away is this big.'"

--Fred Chappell
Troutnut
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Bellevue, WA

Posts: 2758
Troutnut on Aug 14, 2020August 14th, 2020, 6:49 am EDT
Yeah, Drunella grandis is a cool-looking mayfly! Check out Drunella spinifera, which takes those features to an even greater extreme.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

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