The genal gland of Nasonia giraulti (Hymenoptera: Pteromalidae), SBFSEM.

The class III genal gland is located anteriorly on the gena and is composed of 7-8 enlarged gland cells. The cytoplasm of these cells are electron-dense and the cells are filled with white electron-lucent vesicles. Each cell is characterized by the presence of a single microvillus-embedded end apparatus that is continuous with cuticle-embedded ducts that open anterolaterally on the pleurostomal surface without ductule conglomeration. The glandular cells are located between the dorsal genomandibular gland and the anterior branch of the mandibular adductor muscle. We did not observe any difference in the size of the genal glands between male and female specimens or specimens from different species.

Cells of the genal gland are less electron-dense and possess microvilli-embedded end apparatuses that continue into cuticular canals  exiting at the pleurostoma.