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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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Mayfly Genus Cinygma (Western Light Cahills)

This uncommon Western genus is closely related to Cinygmula. It rarely provides good hatches.

Where & when

Time of year : April through September

In 9 records from GBIF, adults of this genus have been collected during August (44%), June (22%), April (22%), and July (11%).

In 1 record from GBIF, this genus has been collected at elevation of 7000 ft.

Genus Range

Hatching behavior

These mayflies emerge in the surface flim.

Nymph biology

Current speed: Slow

Specimens of the Mayfly Genus Cinygma

2 Male Spinners
1 Female Spinner
1 Nymph

Discussions of Cinygma

Cinygma mayflies
2 replies
Posted by Bnewell on Jul 15, 2011
Last reply on Jul 19, 2011 by Entoman
Perhaps one reason Cinygma mayflies do not create much interest for fishermen is because of their habit. They seem to prefer these small headwater streams, often streams without trout.

Start a Discussion of Cinygma

References

Mayfly Genus Cinygma (Western Light Cahills)

Genus Range
Common Name
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