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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 Glossosoma (Glossosomatidae) (Little Brown Short-horned Sedge) Caddisfly Larva from the Yakima River in Washington
I caught this tiny larva without a case, but it seems to key pretty clearly to to Glossosomatidae. From there, the lack of sclerites on the mesonotum points to either Glossosoma or Anagapetus. Although it's difficult to see in a 2D image from the microscope, it's pretty clear in the live 3D view that the pronotum is only excised about 1/3 of its length to accommodate the forecoxa, not 2/3, which points to Glossosoma at Couplet 5 of the Key to Genera of Glossosomatidae Larvae.
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 Pseudocloeon (Tiny Blue-Winged Olives)

Taxonomic History

All North American species previously assigned to the genus Pseudocloeon have been moved to other genera. However, the genus is mentioned so often in angling books that I'm keeping a page online for it as a reference to where these species were moved:

Pseudocloeon anoka = Iswaeon anoka
Pseudocloeon carolina = Acentrella turbida
Pseudocloeon dubium = Plauditus dubius
Pseudocloeon edmundsi = Iswaeon anoka
Pseudocloeon futile = Apobaetis futilis
Pseudocloeon propinquum = Labiobaetis propinquus
Pseudocloeon punctiventris = Plauditus punctiventris
Pseudocloeon turbidum = Acentrella turbida

Several other less well-known species were also moved to Labiobaetis.

Start a Discussion of Pseudocloeon


  • Caucci, Al and Nastasi, Bob. 2004. Hatches II. The Lyons Press.

Mayfly Genus Pseudocloeon (Tiny Blue-Winged Olives)

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