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.

Here Oksrukuyik Creek flows away from the Dalton Highway toward the pipeline. It eventually grows into one of the major rivers of the North Slope, and the main drainage to the west of the Sag, but where it crosses the road it's just a small grayling stream.

From Oksrukuyik Creek in Alaska

Stream photos

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Amphizoa Beetle Larva Amphizoa Beetle Larva

Dorsal view of a Amphizoa (Amphizoidae) Beetle Larva from Sears Creek in Washington

This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).

5 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.

Cheumatopsyche (Little Sister Sedge) Caddisfly Adult Pictures

Ruler view of a Cheumatopsyche (Hydropsychidae) (Little Sister Sedge) Caddisfly Adult from Mystery Creek #43 in New York The smallest ruler marks are 1 mm.

Lateral view of a Cheumatopsyche (Hydropsychidae) (Little Sister Sedge) Caddisfly Adult from Mystery Creek #43 in New York

Ventral view of a Cheumatopsyche (Hydropsychidae) (Little Sister Sedge) Caddisfly Adult from Mystery Creek #43 in New York

Cheumatopsyche (Hydropsychidae) (Little Sister Sedge) Caddisfly Adult from Mystery Creek #43 in New York

This caddisfly was collected from Mystery Creek #43 in New York on September 19th, 2006 and added to Troutnut.com by Troutnut on October 4th, 2006.

Discussions of this Adult

Cheumatopsyche

Posted by Litobrancha on Oct 20, 2006

Last reply on Oct 20, 2006 by Litobrancha

a great thing about cheumatopsyche (which i believe this is) is that the IX segment ventral plates are almost always completely differentiated to the base. hydropsyche medial margins are more indistinct near the base.

also cheumatopsyche almost always lacks F1 in the hind wings, although aberrant specimens are common. the best character is the distance between M and Cu veins in the hind wing, other hydropsychids are parallel and close together, cheumatopsyche diverges a bit.

Looks like Cheumatopsyche

Posted by GONZO on Oct 6, 2006

Last reply on Oct 6, 2006 by GONZO

Really cool pictures, Jason. My first impression was classic Cheumatopsyche (Little Sister Sedge), and I can't find anything to indicate otherwise--size, color, maxillary palp, and wing all seem right on. Wish I could help with the species, but with many caddisflies I'm happy just to get the genus right. :)

It is interesting to note that some books say that the coloring of many Cheumatopsyche species gets lighter as the season progresses. That certainly doesn't seem to be the case here.

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References

Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.