The results show that there are thirty-three species of protozoan in the water in Kaifeng, including twenty-one ciliates, eleven flagellates and one sarcodinids.

• 结果显示，开封市郊水系中共有原生动物33种（属），其中纤毛虫类占绝对优势有21种，鞭毛类11种、肉足类1种。