(2) The macronucleus became shorter and thicker, finally oblate during the division of the cell.Then the macronucleus restored its original shape, band-like form.

• (2)大核在虫体分裂过程中由长带状逐渐缩短变粗至扁圆形,于虫体即将分开时迅速拉长，然后分裂为二个新大核;