Abstract
In the germaria of oviparae of the vetch aphid, Megoura viciae Buckton (Homoptera : Aphididae), the trophocytes are syncytial and arranged around a trophic core, to which they are all joined. Resting oocytes occur in the posterior region of the germaria, and encircle the basal region of the nutritive cord. The trophocytes contain mitochondria, ribosomes, vesicles, electron-dense spheres and a single large nucleus that is highly lobed and has many nucleopores. Electron-dense, “nuage-like” materials are confluent between nucleoplasm and cytoplasm, suggesting nucleocytoplasmic transport. Exterior to the trophocytes, a unicellular sheath surrounds each germarium, bordered to the exterior by a tunica propria. The cells of the sheath are continuous with the prefollicular tissue. Only one oocyte in each ovariole undergoes vitellogenesis at a time.
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