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.

This is one of the many shallow, unnamed lakes in the Arctic coastal plain near the Dalton Highway.

From Dalton Highway in Alaska

Stream photos

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Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva Onocosmoecus (Great Late-Summer Sedge) Caddisfly Larva

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.

9 Recently Added Photos

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.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

One of several new specimens today

Psilotreta labida (Dark Blue Sedge) Caddisfly Larva

9 Pictures

Case view of a Psilotreta labida (Odontoceridae) (Dark Blue Sedge) Caddisfly Larva from Fall Creek in New York

Collected March 29, 2007 from Fall Creek in New York

Added by Troutnut on April 2, 2007

Collected March 29, 2007 from Fall Creek in New York and added by Troutnut on April 2, 2007

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Apr 2, 2007April 2nd, 2007, 6:00 pm EDT

I added several new bugs I collected this week to the site tonight, including this caddisfly. Anybody care to ID it?

To view all the new specimens, go to any page of this site outside the forum section (like the homepage) and look under "recent updates" in the left column.

I'll be adding some even better bug pictures tomorrow from a collecting trip a couple days later.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

BGrnFlyfish
Wisconsin

Posts: 37

BGrnFlyfish on Feb 12, 2009February 12th, 2009, 4:19 am EST

Jason,

I was on a stream the other day in the driftless area and i found a couple of caddis on some of the rocks. They looked exactly like this one does but for their casing it wasn't used with little rocks, it was the wood type casing. -(brownish black) the caddis had a green body and a head like that one..

Seth-Big Green River, WI

Troutnut

Administrator
Bellevue, WA

Posts: 2758

Troutnut on Feb 12, 2009February 12th, 2009, 7:16 am EST

Lots of cased caddisflies look similar to this, with the green body and dark head. You often have to get into trickier anatomical details to figure out the genus, or even the family.

Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist

Creno
Grants Pass, OR

Posts: 302

Creno on Feb 12, 2009February 12th, 2009, 1:04 pm EST

Interesting timing - I was just looking at Psilotreta larvae yesterday. This one is probably Psilotreta labida.

Creno