The macrogametocyte develops into macrogamete, its nucleus moves to the surface where the projection is formed
Fertilization occurs when the microgamete penetrates through the projection.
The fusion product is zygote, within 24 h. it elongates to become a motile ookinete
The ookinete penetrates the brush border of the mid gut epithelial cells to the outer surface and round up, called oocyst.