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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.

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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Armored Mayflies

This common name refers to only one family. Click its scientific name to learn more.

Mayfly Family Baetiscidae

These are pretty much always called Armored Mayflies.
The mayflies of this family are known mostly for their curious shapes, but they can create excellent spinner falls, too. Read about Baetisca, the only genus in this family, for details.
Artistic view of a Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Dun from the Marengo River in Wisconsin
Lateral view of a Female Baetisca laurentina (Baetiscidae) (Armored Mayfly) Mayfly Spinner from the Bois Brule River in Wisconsin

Armored Mayflies

Scientific Name
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