XYZ

epipharynx

Membraneous extension of the upper lip (labium), in fact its outwardly protruding inside. The epipharynx may bear a number of specialised flattened setae.

epipharynx

Zeugophora sp., from Medvedev & Zajcev (1978a). From the top down: the clypeus, upper lip (labium) and the epipharynx with specialised, flattened, epipharyngeal seta