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.

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

This seems to be a young larva of Limnephilus. Although not clear in the picture, several ventral abdominal segments have chloride epithelia.

7 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.

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Isonichya Bicolor, Page 2

This topic is about the Mayfly Family Isonychiidae

See Isonychia for details. It is the only North American genus in this family.

Example specimens

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Female Isonychia (Slate Drake) Mayfly Spinner

Artistic view of a Female Isonychia (Isonychiidae) (Slate Drake) Mayfly Spinner from the Teal River in Wisconsin

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Female Isonychia bicolor (Mahogany Dun) Mayfly Dun

Lateral view of a Female Isonychia bicolor (Isonychiidae) (Mahogany Dun) Mayfly Dun from the Namekagon River in Wisconsin

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Female Isonychia bicolor (Mahogany Dun) Mayfly Spinner

Lateral view of a Female Isonychia bicolor (Isonychiidae) (Mahogany Dun) Mayfly Spinner from the West Branch of Owego Creek in New York

I collected this female together with a male.

Oldredbarn

Novi, MI

Posts: 2600

Oldredbarn on Mar 29, 2012March 29th, 2012, 6:22 am EDT

When these threads morph (as they often seem to do), it would be nice if the topic originators would perhaps modify the titles to recognize this... Craig? But even this won't de-link it from the improper taxon. This, and avoiding multiple ID requests in the same thread would be a big help. Unfortunately this happens a lot. There's a lot of great commentary by the bug guys on this forum buried in unrelated topics.

Good luck with this Kurt...;)

"Even when my best efforts fail it's a satisfying challenge, and that, after all, is the essence of fly fishing." -Chauncy Lively

"Envy not the man who lives beside the river, but the man the river flows through." Joseph T Heywood

Entoman

Northern CA & ID

Posts: 2604

Entoman on Mar 29, 2012March 29th, 2012, 12:43 pm EDT

I must admit that nothing I have access to (other than Schwiebert) goes into infuscation or body coloration in a way that's much help. I just threw neglectus on the table based on size (8mm range vs. 12-16mm for distinctus) and the eyes (small black vs. larger & olive for distinctus). Both characters are tough to work with if they're close as there's no way to verify the accuracy of the measurement and eye color is often impacted by photographic lighting conditions and artifact.

At first I was thinking this was a female distinctus (because of the little black eyes) before Roger mentioned the size. Didn't notice the claspers neatly tucked against the terminal seg! Nobody mentioned my gender confusion, but I edited it anyway.:)

"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman