Reproductive Organ of Blow Fly, Chrysomya megacephala (Diptera: Calliphoridae): Ultrastructural of Testis
Figure 4
TEM micrographs of the testis of a 3-day-old C. megacephala. (a) Transverse section showing the strata forming the testicular wall formed by an external layer (el), a peritoneal sheath (ps), a muscular layer (m), and a basement membrane (bm). Rounded grains containing pigment, with varying density levels, are spread in the cytoplasm (arrows). (b) Germ cells showing group of pear-shaped cells. (c) Primary spermatocyte (spc 1) with packed electron-dense chromatin and secondary spermatocyte (spc 2) which is characterized by four groups of separated nuclei. (d) Spermatozoa with nuclei (n) and flagellum (arrow).
