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.

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.

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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 Family Potamanthidae (Golden Drakes)

See the genus Anthopotamus for details. It is the only North American genus in this family. Anthopotamus distinctus is its most important species.

Many anglers still know it as Potamanthus, but that name is outdated.

Where & when

In 99 records from GBIF, adults of this family have mostly been collected during June (48%), July (34%), and August (12%).

In 34 records from GBIF, this family has been collected at elevations ranging from 618 to 5003 ft, with an average (median) of 3133 ft.

Family Range

source

Map of specific collection sites

Identification

To determine whether a specimen of Ephemeroptera belongs to Potamanthidae, use the Key to Families of Mayfly Nymphs.

Start a Discussion of Potamanthidae