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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Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva Clostoeca disjuncta (Northern Caddisfly) Caddisfly Larva

Lateral view of a Clostoeca disjuncta (Limnephilidae) (Northern Caddisfly) Caddisfly Larva from the Yakima River in Washington

This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.

11 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.

Chloroperlidae (Sallfly) Stonefly Nymph Pictures

Ventral view of a Chloroperlidae (Sallfly) Stonefly Nymph from the Chena River in Alaska

Dorsal view of a Chloroperlidae (Sallfly) Stonefly Nymph from the Chena River in Alaska

Chloroperlidae (Sallfly) Stonefly Nymph from the Chena River in Alaska

Ruler view of a Chloroperlidae (Sallfly) Stonefly Nymph from the Chena River in Alaska The smallest ruler marks are 1 mm.

This stonefly was collected from the Chena River in Alaska on May 10th, 2008 and added to Troutnut.com by Troutnut on April 20th, 2011.

Discussions of this Nymph

Chloroperlidae

2 replies

Posted by GONZO on Apr 27, 2011

Last reply on Apr 28, 2011 by Shawnny3

Hi Jason,

This is a chloroperlid. Among other traits, the tiny, asymmetrically inserted terminal segment of the maxillary palp is distinctive for this family.

The revamped site is cool. Nice work.

Best,
Lloyd

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