When the female is under control, the male seizes her cerci with his hypovalves and opens her genital chamber. After that, the male inserts his aedeagus into her genital chamber, with the lateral membranes of the female A9 obstructing the paired lateral processes into the genital chamber (Fig. 4b). Then the male adjusts his posture, thus enabling the phallotreme to contact the copulatory pore of the female to deliver his sperm ejaculates into the female spermatheca. During copulation the male keeps the stability of genital connection by using the lobe-like basal teeth of his gonostyli to restrict the movement of the genital plate (Figs 4b, 5c) and utilizing the basal processes of his gonostyli to prevent the female abdomen from shaking off the male control. The coupling genital structures mesh completely when the mating position changes from a V-shape to an end-to-end position.