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.

For how many years, I wonder, have these huge slabs of rock sheltered wild brook trout?

From Mystery Creek # 89 in New York

Stream photos

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Limnephilus (Summer Flier Sedge) Caddisfly Larva Limnephilus (Summer Flier Sedge) Caddisfly Larva

Case view of a Limnephilus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from the Yakima River in Washington

24 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 Limnephilus externus (Summer Flier Sedges)

Where & when

In 101 records from GBIF, adults of this species have mostly been collected during August (30%), September (28%), July (20%), October (13%), and June (8%).

In 70 records from GBIF, this species has been collected at elevations ranging from 3 to 22123 ft, with an average (median) of 1932 ft.

Species Range

source

Map of specific collection sites

Specimens of the Caddisfly Species Limnephilus externus

1 Adult

Limnephilus externus (Summer Flier Sedge) Caddisfly Adult

1 Picture

Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Adult from the Touchet River in Washington

Collected September 14, 2011 from the Touchet River in Washington

Added by Bnewell on September 21, 2011

Collected September 14, 2011 from the Touchet River in Washington and added by Bnewell on September 21, 2011

1 Male Adult

Male Limnephilus externus (Summer Flier Sedge) Caddisfly Adult

5 Pictures

Lateral view of a Male Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Adult from the Henry's Fork of the Snake River in Idaho

Collected August 10, 2018 from the Henry's Fork of the Snake River in Idaho

Added by Troutnut on June 12, 2019

Collected August 10, 2018 from the Henry's Fork of the Snake River in Idaho and added by Troutnut on June 12, 2019

1 Larva

Limnephilus externus (Summer Flier Sedge) Caddisfly Larva

1 Picture

Limnephilus externus (Limnephilidae) (Summer Flier Sedge) Caddisfly Larva from Temporary ponds- Glacier Nat. Park in Alaska

This caddis is one of the most abundant caddisflies in temporary ponds of Glacier Park. The larvae build a round case of detritus and dead plant material that can get quite large.

Collected June 24, 2008 from Temporary ponds- Glacier Nat. Park in Alaska

Added by Bnewell on June 26, 2011

Collected June 24, 2008 from Temporary ponds- Glacier Nat. Park in Alaska and added by Bnewell on June 26, 2011