alternative definition added almost 15 years ago by Andy Deans
the basal fold of the wing, or line of flexion between the base of the mediocubital field and axillary region, forming a prominent convex fold in the flexed wing extending between the median plates from the articulation of the radius with the second axillary to the articulation of the vannal veins with the third axillary
Reference: Snodgrass, R. E. 1935. Principles of insect morphology. McGraw-Hill Book Co., Inc., New York & London 667 pp.
Cross reference:
None provided.