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.
Anal vein: The anal veins (denoted A1, A2, etc.) are all the longitudinal veinsposterior to the cubitus, often occupying only a small portion of the wing in mayflies.
These other words reference the same concept: anal veins, vein A1, A1 vein, A1, vein A2, A2 vein, A2.
