Radial sector: The radial sector (denoted Rs) is group of longitudinal wing vein branches that arise posteriorly from the radius. In caddisflies, vein Rs divides into two branches (R2+3 and R4+5), which both split again, forming four total branches R2 through R5.
These other words reference the same concept: vein Rs, Rs vein, Rs, R2, vein R2, R2 vein, R3, vein R3, R3 vein, R4, vein R4, R4 vein, R5, vein R5, R5 vein, R2+3, vein R2+3, R2+3 vein, R4+5, vein R4+5, R4+5 vein.
