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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.

A small spring creek in Wisconsin. A little brook trout stream tumbles over boulders

Stream photos

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Male Baetidae (Blue-Winged Olive) Mayfly DunMale Baetidae (Blue-Winged Olive) Mayfly Dun
Lateral view of a Male Baetidae (Blue-Winged Olive) Mayfly Dun from Mystery Creek #308 in Washington
This dun emerged from a mature nymph on my desk. Unfortunately its wings didn't perfectly dry out.
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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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True Fly Family Athericidae (Watersnipe Flies)

See the genus Atherix, which is the primary representative of this family in North America, for details.

Where & when

In 19 records from GBIF, adults of this family have been collected during June (37%), July (32%), May (21%), and April (11%).

In 2 records from GBIF, this family has been collected at elevations of 3051 and 6699 ft.

Family Range
Map of specific collection sites

Specimens of the True Fly Family Athericidae

3 Larvae

Start a Discussion of Athericidae

True Fly Family Athericidae (Watersnipe Flies)

Taxonomy
  1. Kingdom Animalia (Animals)
  2. » Phylum Arthropoda (Arthropods)
  3. » Class Insecta (Insects)
  4. » Order Diptera (True Flies)
  5. » Family Athericidae (Watersnipe Flies)
Genus in Athericidae
Atherix
3
13
Genus in Athericidae: Atherix
1 genus (Suragina) isn't included.
Family Range
Map of specific collection sites
Common Names
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