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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Isoperla (Stripetails and Yellow Stones) Stonefly Adult Isoperla (Stripetails and Yellow Stones) Stonefly Adult

Dorsal view of a Isoperla (Perlodidae) (Stripetails and Yellow Stones) 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 'intercalary medius posterior' in Mayflies

Intercalary medius posterior: An intercalary vein located between the branches of the media posterior. It is a ridge vein (+).

These other words reference the same concept: vein IMP, IMP vein, IMP.

Blue-winged OlivesBaetis

Definition of 'intercalary medius posterior' in Mayflies

Definition of 'intercalary medius posterior' in Mayflies

Blue-winged Olives
Baetis