Figure 5.

Morphology of the male genital bulb of M. sociabilis . A – B: LM; C – D: TEM. A – B: Semi-thin cross sections of the genital bulb showing duct (A) and reservoir (B) of the bulbus gland. Asterisk marks the homogenous plug material in duct lumen. C – D: Ultrathin section showing secretion in the lumen of the bulbus gland. BG – bulbus gland, BGL – bulbus gland lumen, bH – basal haematodocha, E – embolus, Mi – mitochondria, Mv – microvilli, N – nucleus, S – spermophor, Sec – secretion, SF – seminal fluid, SG – spermophor gland, SGL – spermophor gland lumen, V – vesicles.