The
area of the
epipharyngeal wall that is posterior to the
epipharyngeal lobe, is thicker than surrounding regions of the
epipharyngeal wall and is covered with dorsally oriented acanthae.
written by: Beutel, R., and L. Vilhelmsen. 2007. Head anatomy of Xyelidae (Hexapoda: Hymenoptera) and phylogenetic implications. Organisms, Diversity & Evolution 7:207-230.