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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 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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This topic is about the Caddisfly Family Hydroptilidae

Both anglers and entomologists know these diminutive flies as "Microcaddisflies." The term refers to this family specifically, not to all tiny caddisflies. Many are large enough for imitation on small hooks, but some are impossibly small, as tiny as hook size 36.

Like the Tricorythodes mayflies, Microcaddisflies can be important to trout because of their extreme abundance in certian waters.

Example specimens

Motrout
Motrout's profile picture
Posts: 319
Motrout on Jun 11, 2014June 11th, 2014, 5:41 pm EDT
Goodness.

At least everything ended with you in a better fly fishing locale than Missouri......

I'm still here but I manage to catch a trout every once in awhile anyway:)
"I don't know what fly fishing teaches us, but I think it's something we need to know."-John Gierach
http://fishingintheozarks.blogspot.com/
Pdcox
Kansas city

Posts: 12
Pdcox on Dec 10, 2019December 10th, 2019, 11:54 pm EST
GLad I stumbled on this thread. Was fishing the Niangua and experienced what i thought was a hatch of smuts. However after finding this conversation, it makes a lot of sense that i found black caddis. Now that is a first for me. I persuaded a trout to hand over a few , and here they are.

https://pauldavid.smugmug.com/Bugs/i-TNGtZcM
https://pauldavid.smugmug.com/Bugs/i-ggdDd2n

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