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URI: none
A sclerotized area at the anterior fore wing margin, basal to the pterostigma, often consisting simply of an extension of the first abscissa of the radial sector of the fore wing (1RS).
written by: Karlsson, D., and F. Ronquist. 2012. Skeletal Morphology of Opius dissitus and Biosteres carbonarius, with a Discussion of Terminology and Morphological Variation in Opiinae (Hymenoptera: Braconidae). PLoS ONE 7:1-38.

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