The lobe of the labium that is limited posteroproximally by the prementum, anteroproximally by the fold traversing the salivary orifice and laterally by the paraglossae.
written by: Popovici, O. A., I. Mikó, K. Seltmann, and A. R. Deans. 2012. The maxillo-labial complex in Sparasion (Platygastroidea: Platygastridae). Journal of Hymenoptera Research in prep.