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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.

Lateral view of a Onocosmoecus (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen keys pretty easily to Onocosmoecus, and it closely resembles a specimen from Alaska which caddis expert Dave Ruiter recognized as this genus. As with that specimen, the only species in the genus documented in this area is Onocosmoecus unicolor, but Dave suggested for that specimen that there might be multiple not-yet-distinguished species under the unicolor umbrella and it would be best to stick with the genus-level ID. I'm doing the same for this one.
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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Pycnopsyche (Great Autumn Brown Sedge) Caddisfly Larva Pictures

Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Look closely at these pictures of the case and you can see it's not solid wood pieces, but that some of the silk used to attach the wood is showing through in the cracks.

Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Case view of a Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
I cut open the top of this larva's case and spread it out so you can see what the inside looks like.  It's a tough coating of silk, surprisingly thick.

Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Dorsal view of a Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York
This is a big one.

Ruler view of a Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York The smallest ruler marks are 1 mm.
Pycnopsyche (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from Mystery Creek #62 in New York

This caddisfly was collected from Mystery Creek #62 in New York on April 1st, 2007 and added to Troutnut.com by Troutnut on April 3rd, 2007.

Discussions of this Larva

good Trichoptera key
4 replies
Posted by Earlfishman on Apr 11, 2007
Last reply on Apr 17, 2007 by GONZO
Find a used copy of Wiggin's "trichoptera larvae of north america" or some similar title. It is the best guide to get to genus for all the caddis you may run across
Possibly Pycnopsyche
Posted by GONZO on Apr 3, 2007
Last reply on Apr 3, 2007 by GONZO
Based on the case and the size, I'd tenatively guess Pycnopsyche. But someone else may have a way to key the larva.

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Pycnopsyche (Great Autumn Brown Sedge) Caddisfly Larva Pictures

Collection details
Location: Mystery Creek #62, New York
Date: April 1st, 2007
Added to site: April 3rd, 2007
Author: Troutnut
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