alternative definition added about 15 years ago by Istvan Miko
The ventral dilatators arise on the proximal end of the ventral part of the prementum; they insert on the salivarial sclerite.
Reference: Vilhelmsen, L. 1996. The preoral cavity of lower Hymenoptera (Insecta): comparative morphology and phylogenetic significance. Zoologica Scripta 25:143-170.
Cross reference:
None provided.