The nerve systems of Gieysztoria pulchra and Microdalyellia sinensis were described by the distribution of acetylcholinesterase (AChE) with histochemical methods.The results indicated: 1.

• 利用乙酰胆碱脂酶分布定位的组织化学方法，描述了丽杰氏涡虫和中国小达氏涡虫的神经系统。