part of wing membrane cubitomarginal ridge A faint ridge or convex fold of the wing membrane running parallel to the wing margin across the apex of the cubitus anterior, extending anteriorly at least halfway to the apex of media-three-plus-four posteriorly fading away near the anal vein. Abbr: cm in ISBN:0-937548-00-6. TGMA:0000474 TGMA:0000474 default_namespace