Fig. 13

Reproductive system of Macrosiphum calvulum oviparous female. (A) schematic drawing of a whole system. (B) longitudinal and (C) frontal semi-thin sections through the abdomen shoving details of system organization. Inset in (B) shows vitellogenic oocyte with a well-visible “symbiont ball” (encircled). (D) a longitudinal section through the distal part of the system showing a fragment of accessory gland, common oviduct and spermatheca. (E) ultrastructural details of tropharium and bacteriocyte. (F, G) fragments of spermatheca with well-visible sperm embedded in a secretion of various electron densities (stars). ac-alimentary canal; ag-accessory glands; b-bacteria; ba-bacteriocyte; co-common oviduct; evo-early vitellogenic oocyte; es-epithelial sheath; fb-fat body; lo-lateral oviduct; ms-muscles; ov-ovarioles; po- previtellogenic oocyte; s-spermatheca; sp-sperm; tr-tropharium; tro-trophocyte; vo- vitellogenic oocyte; thread-like inclusions (arrows); cuticle lining spermatheca (double arrows); material of various electron-density (stars). (B, D) Light microscopy, epon sections stained with methylene blue; (E-G) Transmission electron microscopy.