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Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

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Caddisfly Genus Onocosmoecus (Great Late-Summer Sedge)

The most common species of this genus is Onocosmoecus unicolor.

Where & when

Time of year : Late summer and early fall

Preferred waters: Lakes and slow streams

This genus is nearly as large as Dicosmoecus, but not quite as impressive because its emergence is less concentrated. It can still produce fishable hatches, especially in lakes.

In 83 records from GBIF, adults of this genus have mostly been collected during July (34%), June (25%), August (23%), and September (11%).

In 55 records from GBIF, this genus has been collected at elevations ranging from 16 to 10840 ft, with an average (median) of 5092 ft.

Genus Range

Larva & pupa biology

Diet: Mostly detritus

Current speed: Slow or still

Specimens of the Caddisfly Genus Onocosmoecus

2 Adults
1 Male Adult
3 Larvae

Start a Discussion of Onocosmoecus


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

Caddisfly Genus Onocosmoecus (Great Late-Summer Sedge)

» Genus Onocosmoecus (Great Late-Summer Sedges)
Species in Onocosmoecus
Onocosmoecus unicolor
Species in Onocosmoecus: Onocosmoecus unicolor
1 species (Onocosmoecus sequoiae) isn't included.
Genus Range
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