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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 Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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.

Onocosmoecus unicolor (Great Late-Summer Sedge) Caddisfly Adult Pictures

One key characteristic not clearly photographed, but clear in under the microscope: this specimen's midtibiae have 2 apical spurs and 1 preapical spur.

Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Ventral view of a Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Lateral view of a Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Ruler view of a Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho The smallest ruler marks are 1 mm.
Fore wing

Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Hind wing, view 1

Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Hind wing, view 2

Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Maxillary palp

Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho
Mesopleuron

Onocosmoecus unicolor (Limnephilidae) (Great Late-Summer Sedge) Caddisfly Adult from Trealtor Creek in Idaho

This caddisfly was collected from Trealtor Creek in Idaho on August 4th, 2020 and added to Troutnut.com by Troutnut on August 20th, 2020.


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Onocosmoecus unicolor (Great Late-Summer Sedge) Caddisfly Adult Pictures

Collection details
Location: Trealtor Creek, Idaho
Date: August 4th, 2020
Added to site: August 20th, 2020
Author: Troutnut
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