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.

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.

Caddisfly Genus Theliopsyche (Little Brown Sedges)

Where & when

Preferred waters: Small streams

This Eastern genus is very localized and is not known to produce fishable hatches.

In 11 records from GBIF, adults of this genus have been collected during May (55%), June (27%), and July (18%).

In 5 records from GBIF, this genus has been collected at elevations ranging from 1152 to 5764 ft, with an average (median) of 1752 ft.

Genus Range

source

Map of specific collection sites

Specimens of the Caddisfly Genus Theliopsyche

1 Female Adult

Female Theliopsyche (Little Brown Sedge) Caddisfly Adult

5 Pictures

Lateral view of a Female Theliopsyche (Lepidostomatidae) (Little Brown Sedge) Caddisfly Adult from Mystery Creek #42 in Pennsylvania

This one has a neat iridescent sheen to its wings.

See the discussion for details on this fly's tentative ID.

Collected May 27, 2007 from Mystery Creek #42 in Pennsylvania

Added by Troutnut on June 4, 2007

Collected May 27, 2007 from Mystery Creek #42 in Pennsylvania and added by Troutnut on June 4, 2007

Start a Discussion of Theliopsyche

References

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