The micronucleus were divided into two before the macronucleus division;(3) The original scopula and stalk contributed to the old cell.The new cell formed scopula gradually after the cell division.

• (3) 原帚胚及柄归属老仔虫, 新仔虫的帚胚在虫体分裂后逐渐形成, 柄内肌丝则在柄鞘形成后逐渐长出。