intercalary vein
(ARTHROPODA: Insecta)
1. An extra longitudinal wing vein of Ephemeroptera.
2. Convex wing vein which follows the crest of a ridge.
3. Concave wing vein on the bottom of a furrow.
4. In Diptera, sometimes applied to the posterior branch of the fourth vein.

Online Dictionary of Invertebrate Zoology. . 2005.

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