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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 Pycnopsyche guttifera (Limnephilidae) (Great Autumn Brown Sedge) Caddisfly Larva from the Yakima River in Washington
This specimen appears to be of the same species as this one collected in the same spot two months earlier. The identification of both is tentative. This one suffered some physical damage before being photographed, too, so the colors aren't totally natural. I was mostly photographing it to test out some new camera setting idea, which worked really well for a couple of closeups.
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.

Rheotanytarsus Midge Larva Pictures

This peculiar midge lived in a case tightly fixed to a rock, with several others of its kind. The case seems to be made of tiny grains of sand. I'm not sure what the function is for the little lines sticking out the front, because they aren't legs.

Here's a natural view of this specimen still attached to its rock quite tightly.  You can faintly see the "corners" on the top of the case, which is not a smooth curve, but is somewhat trapezoidal in cross-section.

Case view of a Rheotanytarsus (Chironomidae) Midge Larva from Cayuta Creek in New York
A millimeter ruler overlaid by the case.

Rheotanytarsus (Chironomidae) Midge Larva from Cayuta Creek in New York
I removed the case from its rock to expose this, the underside.

Rheotanytarsus (Chironomidae) Midge Larva from Cayuta Creek in New York
Here's what lived inside.

Dorsal view of a Rheotanytarsus (Chironomidae) Midge Larva from Cayuta Creek in New York
Rheotanytarsus (Chironomidae) Midge Larva from Cayuta Creek in New York
I don't think we'll need to be imitating this species anytime soon, but it's still a neat insect.

Ruler view of a Rheotanytarsus (Chironomidae) Midge Larva from Cayuta Creek in New York The smallest ruler marks are 1 mm.

This midge was collected from Cayuta Creek in New York on April 14th, 2007 and added to Troutnut.com by Troutnut on April 22nd, 2007.

Discussions of this Larva

lines on front
1 replies
Posted by Mike28 on Mar 27, 2014
Last reply on Mar 28, 2014 by Entoman
I have a small tank with some of these on the rocks and noticed the midges coming out and cleaning the lines so I talked to my stream ecology professor and he told me I have rheotanytarsus and along those lines there are small lines of silk that they use to collect food just in case anyone was still wondering.
Midge
3 replies
Posted by DMM on Apr 22, 2007
Last reply on Apr 23, 2007 by Troutnut
I believe this is Rheotanytarsus

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Rheotanytarsus Midge Larva Pictures

Collection details
Location: Cayuta Creek, New York
Date: April 14th, 2007
Added to site: April 22nd, 2007
Author: Troutnut
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