Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

The North Fork Couer d'Alene River in Idaho

Stream photos

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Coleoptera (Beetle) Insect Larva Coleoptera (Beetle) Insect Larva

Lateral view of a Coleoptera (Beetle) Insect Larva from Sears Creek in Washington

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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 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

References

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