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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.

Dorsal view of a Zapada cinctipes (Nemouridae) (Tiny Winter Black) Stonefly Nymph from the Yakima River in Washington
Nymphs of this species were fairly common in late-winter kick net samples from the upper Yakima River. Although I could not find a key to species of Zapada nymphs, a revision of the Nemouridae family by Baumann (1975) includes the following helpful sentence: "2 cervical gills on each side of midline, 1 arising inside and 1 outside of lateral cervical sclerites, usually single and elongate, sometimes constricted but with 3 or 4 branches arising beyond gill base in Zapada cinctipes." This specimen clearly has the branches and is within the range of that species.
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 Molannidae

See Molanna for details about this relatively unimportant family. It is the only species widespread in America.

Where & when

In 361 records from GBIF, adults of this family have mostly been collected during July (34%), June (33%), August (20%), and May (7%).

In 354 records from GBIF, this family has been collected at elevations ranging from -30 to 10600 ft, with an average (median) of 728 ft.

Family Range

Specimens of the Caddisfly Family Molannidae

1 Larva

Start a Discussion of Molannidae

References

Caddisfly Family Molannidae

Taxonomy
Genus in Molannidae
MolannaGray Checkered Sedges
1
4
Genus in Molannidae: Molanna
1 genus (Molannodes) isn't included.
Family Range
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