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.
Radial crossvein: The radial crossvein (denoted r, or sometimes r-rs) connects the main branch of the radius R1 to the radial sector Rs near the discoidal cell in some caddisflies.
These other words reference the same concept: crossvein r, crossvein r-rs, r crossvein, r-rs crossvein.
This Hydatophylax argus caddisfly does not have a radial crossvein, but I drew in purple where it would be if it were present.
