alternative definition added almost 15 years ago by Istvan Miko
Unpaired muscle arising with a tendon attached to the median anterior part of the tentorial bridge and inserts on the proximal part of the ventral wall of the cibarium or on the proximal margin of the sitophore, immediately distally to the point where the alimentary canal passes between the lateral arms of the sitophore.
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.