Fig. 4From: Human-landing rate, gonotrophic cycle length, survivorship, and public health importance of Simulium erythrocephalum in Zaragoza, northeastern SpainOogenesis in S. erythrocephalum. a Six hours post-feeding: ovaries in stage III (arrows indicate that yolk fills about 30–40% of the follicular space). b 12 to 36 h post-feeding: ovaries in stage IV (yolk is present throughout the follicular space). c 42 to 48 h post-feeding: ovaries in stage V (mature ovarioles)Back to article page