alternative definition added almost 15 years ago by Istvan Miko
The line of separation between the pleural region and the venter; lying mesad of the limb bases, but obscured when the latter are fused with the sterna.
Reference: Snodgrass, R. E. 1935. Principles of insect morphology. McGraw-Hill Book Co., Inc., New York & London 667 pp.
Cross reference:
None provided.