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.
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This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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Mayfly Genus Cloeon (Tiny Sulphur Duns)
Many relevant (although not outstanding) species were once classified in this genus, but entomologists recently found that they belong in the Procloeon genus instead. Only one insignficant species remains in the genus Cloeon in North America.
Where & when
In 192 records from GBIF, adults of this genus have mostly been collected during June (16%), August (16%), May (16%), July (16%), September (15%), April (10%), and October (6%).
In 6 records from GBIF, this genus has been collected at elevations ranging from 492 to 820 ft, with an average (median) of 522 ft.
Genus Range
Start a Discussion of Cloeon
Mayfly Genus Cloeon (Tiny Sulphur Duns)
Taxonomy
1 species (Cloeon dipterum) isn't included.