discoidal vein
(ARTHROPODA: Insecta)
1. In Hymenoptera, the vein forming a continuation of the median vein beyond the end of the transverse median vein, and extending along the posterior margin of the first discoidal cell.
2. In Orthoptera, the first and largest branch of the humeral vein.
3. In Diptera, the media 2.
4. The anterior intercalary vein.

Online Dictionary of Invertebrate Zoology. . 2005.

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