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.

Lone tree on a rock in the middle of Big Lake. Fittingly, Big Lake is the largest of several short wide spots in the upper Brule River.

From the Bois Brule River in Wisconsin

Stream photos

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Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva Glossosoma (Little Brown Short-horned Sedge) Caddisfly Larva

Dorsal view of a Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington

I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.

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.

Caddisfly Species Dicosmoecus gilvipes (October Caddisflies)

Where & when

Time of year : September and October

Preferred waters: Medium to large streams

According to LaFontaine in Caddisflies, this is the main species of Dicosmoecus in Idaho, Oregon, Washington, and British Columbia.

In 24 records from GBIF, adults of this species have mostly been collected during October (50%), September (38%), and November (8%).

In 6 records from GBIF, this species has been collected at elevations ranging from 16 to 3465 ft, with an average (median) of 755 ft.

Species Range

source

Map of specific collection sites

Specimens of the Caddisfly Species Dicosmoecus gilvipes

1 Female Adult

Female Dicosmoecus gilvipes (October Caddis) Caddisfly Adult

16 Pictures

Female Dicosmoecus gilvipes (Limnephilidae) (October Caddis) Caddisfly Adult from the South Fork Snoqualmie River in Washington

I've been hoping to add a really good October Caddis to the photo collection here for years, but so far I had struck out on finding them on the river. Tonight, this one flew into the kitchen during a pizza party at a house along the river, and was quickly pointed out -- one of the perks of hanging out with other aquatic biologists! Maybe next year I can finally get a salmonfly on taco night or something.

Collected September 28, 2017 from the South Fork Snoqualmie River in Washington

Added by Troutnut on September 29, 2017

Collected September 28, 2017 from the South Fork Snoqualmie River in Washington and added by Troutnut on September 29, 2017