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.

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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 'anal vein' in Stoneflies

Anal vein: The anal veins (denoted A₁, A₂, etc.) are all the longitudinal veins posterior to the cubitus. Stonefly hind wings are typically notched or folded near the posterior branch of the cubitus, and the anal veins are found beyond that fold in the anal region.

These other words reference the same concept: anal veins, anal region, vein A₁, A₁ vein, A₁, vein A₂, A₂ vein, A₂, vein A₃, A₃ vein, A₃.

Blue-winged OlivesBaetis

Definition of 'anal vein' in Stoneflies

Definition of 'anal vein' in Stoneflies

Blue-winged Olives
Baetis