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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

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.

Lateral view of a Psychodidae True Fly Larva from Mystery Creek #308 in Washington
This wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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 Genus Neureclipsis (Little Red Twilight Sedges)

This genus is reported to be important on trout streams sometimes, but not often. The only species individually mentioned is not considered to be important.

Where & when

In 276 records from GBIF, adults of this genus have mostly been collected during June (24%), July (22%), May (19%), August (18%), and September (12%).

In 99 records from GBIF, this genus has been collected at elevations ranging from 3 to 4544 ft, with an average (median) of 1178 ft.

Genus Range

Larva & pupa biology

Current speed: Slow

Shelter type: Nets

Gary LaFontaine describes the unique net arrangement of these larvae in Caddisflies:

The carnivorous larvae string their trumpet-shaped nets on debris and rooted plants poking up from the bottom. They arrange them vertically on the object, each net filtering its victims from one little slice of the water column.

Start a Discussion of Neureclipsis


  • LaFontaine, Gary. 1981. Caddisflies. The Lyons Press.

Caddisfly Genus Neureclipsis (Little Red Twilight Sedges)

Species in Neureclipsis
Neureclipsis crepuscularis
Species in Neureclipsis: Neureclipsis crepuscularis
5 species (Neureclipsis bimaculata, Neureclipsis melco, Neureclipsis piersoni, Neureclipsis timesis, and Neureclipsis validus) aren't included.
Genus Range
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