Surface structure of spermatozoon of cestoda Moniezia expansa was observed by using scanning electron microscopy. The mature spermatozoon of Moniezia expansa was filiform, tapered at both ends at lower magnification. Under high magnification, its surface structure was rope-like, caused by 25 to 45 degree spiral cortical microtubules around the sperm axis. Diversity of mature spermatozoa of cestoda in the Order Cyclophyllidea was discussed.国家自然科学基金(No·39900109);; 留学回国基金及华南农业大学校国际合作基金资助项目~
