Morphology and Ultrastructure of Brain Tissue and Fat Body from the Flesh Fly, Sarcophaga bullata Parker (Diptera: Sarcophagidae), Envenomated by the Ectoparasitic Wasp Nasonia vitripennis (Walker) (Hymenoptera: Pteromalidae)
Figure 1
Ultrastructure of brains from young pharate adults of S. bullata following envenomation by N. vitripennis. At 0 and 0.5 h postenvenomation, neuronal cells in brain tissues from healthy and envenomated flies appeared virtually identical in appearance. Neuronal nuclei (Nu) were euchromatic with a regular oval shape. By 1 h and 3 h, neuronal nuclei displayed irregularity of shape with indentations in nuclear envelope (NE) and the cytoplasm became more electron dense. At 6 h after envenomation, large heterochromatic inclusions (HI) were evident within nuclei of many of the cells and the nuclei became very irregular in shape. By 24 h, large heterochromatic inclusions were present in nuclei of cells from envenomated flies. Nuclear envelopes remained intact but were irregular in shape.
