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Lateral view of a Female Hexagenia limbata (Ephemeridae) (Hex) Mayfly Dun from the Namekagon River in Wisconsin
Hex Mayflies
Hexagenia limbata

The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.

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.
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.
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Caddisfly Family Odontoceridae

See Psilotreta for details about the most important genus. It is an important genus with several important quirks.

The other genera are not abundant in trout streams.

Where & when

In 95 records from GBIF, adults of this family have mostly been collected during June (49%), May (24%), and July (13%).

In 75 records from GBIF, this family has been collected at elevations ranging from 20 to 8301 ft, with an average (median) of 2621 ft.

Family Range

Specimens of the Caddisfly Family Odontoceridae

1 Male Adult
1 Larva

Start a Discussion of Odontoceridae


Caddisfly Family Odontoceridae

Genus in Odontoceridae
PsilotretaDark Blue Sedges
Genus in Odontoceridae: Psilotreta
5 genera (Marilia, Namamyia, Nerophilus, Parthina, and Pseudogoera) aren't included.
Family Range
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