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pterostigma

Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
No Taxon (Glossary)
No Taxon (P)
No Taxon pterostigma
Explanation of Names
From Greek ptero, a wing, and stigma, a mark.
Identification
pterostigma noun - The name given to the second costal cell of the wing when it is opaque. Sometimes simply called stigma, though this is imprecise. Often prominent in Odonata (dragonflies and damselflies).

Photos showing the pterostigma in odonata and other groups:
See Also
Internet References
Wikipedia: Pterostigma