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Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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Male Onocosmoecus unicolor (Great Late-Summer Sedge) Caddisfly Adult Pictures

I 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, which rules out Dicosmoecus. The midtibiae have 2 apical spurs and 1 pre-apical spur, and from there the color pattern of the wing points to Onocosmoecus. The location then narrows the species to unicolor.

This caddisfly was collected from the Yakima River in Washington on September 17th, 2020 and added to Troutnut.com by Troutnut on September 19th, 2020.

Discussions of this Adult

mean one thing, write another?
2 replies
Posted by Creno on Sep 19, 2020
Last reply on Sep 20, 2020 by Creno
Onocosmoecus unicolor?

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Male Onocosmoecus unicolor (Great Late-Summer Sedge) Caddisfly Adult Pictures

Collection details
Location: Yakima River, Washington
Date: September 17th, 2020
Added to site: September 19th, 2020
Author: Troutnut
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