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.

Stream photos

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Female Skwala (Large Springfly) Stonefly Adult Female Skwala (Large Springfly) Stonefly Adult

Lateral view of a Female Skwala (Perlodidae) (Large Springfly) Stonefly Adult from Mystery Creek #308 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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Definition of 'elytroid'

Elytroid: The gills on some mayfly nymphs which are enlarged as shields to protect the other gills (as on Tricorythodes and Eurylophella nymphs) are called elytroid gills.

The elytroid gills of a Caenis nymph. — The elytroid gills of a *Caenis* nymph.

Blue-winged OlivesBaetis

Definition of 'elytroid'

Definition of 'elytroid'

Blue-winged Olives
Baetis