The
flange that extends along the
margin of the
mesoscutellum reducing its opening into the lumen of the
mesoscutellum.
written by: Vilhelmsen, L. B., I. Miko, and L. Krogmann. 2010. Beyond the wasp waist: structural diversity and phylogenetic significance of the mesosoma in apocritan wasps (Insecta: Hymenoptera). Zoological Journal of the Linnean Society [=Journal of the Linnean Society of London, Zoology] 159:22-194.