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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

Dorsal view of a Grammotaulius betteni (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington
This is a striking caddis larva with an interesting color pattern on the head. Here are some characteristics I was able to see under the microscope, but could not easily expose for a picture:
- The prosternal horn is present.
- The mandible is clearly toothed, not formed into a uniform scraper blade.
- The seems to be only 2 major setae on the ventral edge of the hind femur.
- Chloride epithelia seem to be absent from the dorsal side of any abdominal segments.
Based on these characteristics and the ones more easily visible from the pictures, this seems to be Grammotaulius. The key's description of the case is spot-on: "Case cylindrical, made of longitudinally arranged sedge or similar leaves," as is the description of the markings on the head, "Dorsum of head light brownish yellow with numerous discrete, small, dark spots." The spot pattern on the head is a very good match to figure 19.312 of Merritt R.W., Cummins, K.W., and Berg, M.B. (2019). The species ID is based on Grammotaulius betteni being the only species of this genus known in Washington state.
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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Chimarra (Little Black Sedge) Caddisfly Larva Pictures

Chimarra (Philopotamidae) (Little Black Sedge) Caddisfly Larva from Fall Creek in New York
This wins the award for "caddis larva which looks most like a bird."  I wish there were a prize.

Chimarra (Philopotamidae) (Little Black Sedge) Caddisfly Larva from Fall Creek in New York
It seemed to actually be cleaning its mandibles with its legs (or vice versa) in this picture and a couple of others.

Chimarra (Philopotamidae) (Little Black Sedge) Caddisfly Larva from Fall Creek in New York
Ruler view of a Chimarra (Philopotamidae) (Little Black Sedge) Caddisfly Larva from Fall Creek in New York The smallest ruler marks are 1 mm.
A small caddisfly larva. This golden larva belongs to the family Philopotamidae

Lateral view of a Chimarra (Philopotamidae) (Little Black Sedge) Caddisfly Larva from Fall Creek in New York
Chimarra (Philopotamidae) (Little Black Sedge) Caddisfly Larva from Fall Creek in New York

This caddisfly was collected from Fall Creek in New York on March 30th, 2007 and added to Troutnut.com by Troutnut on April 2nd, 2007.

Discussions of this Larva

Chimarra
34 replies
Posted by GONZO on Apr 3, 2007
Last reply on Feb 24, 2014 by Brookyman
If I'm seeing things correctly, this appears to be Chimarra.

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References

Chimarra (Little Black Sedge) Caddisfly Larva Pictures

Collection details
Location: Fall Creek, New York
Date: March 30th, 2007
Added to site: April 2nd, 2007
Author: Troutnut
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