异盘并殖吸虫囊蚴和后尾蚴的扫描电镜观察

扫描电镜观察到异盘并殖吸虫囊蚴卵圆形,其一端可见一钮扣样结构。后尾蚴口吸盘略大于腹吸盘,体表密布单生体棘。口、腹吸盘上分别有2圈和3圈乳突,腹吸盘最内层乳突6个对称分布于腹吸盘孔内。在虫体前半部两侧壁的感觉乳突有些呈散在分布,有些不规则地排列成两纵列,每列约5—6个。

SCANNING ELECTRON MICROSCOPIC OBSERVATION ON THE ENCYSTED AND EXCYSTED METACERCARIAE OF PARAGONIMUS HETEROTREMUS

The surface ultrastructure of metacercariae of Paragonimus heterotremus was studied by scanning electron microscope. Encysted metacercaria was egg-shapped with a button-like structure on its end. The oral sucker of the newly excysted metacercaria was larger than the ventral sucker. Single-pointed spines were covered densely on all of the tegumental surface. There were two and three rings sensory papillae on the oral and ventral suckers, respec- lively. Six papillae of the most inner ring were distributed on the ventral sucker inner-pore symmetrically. A few sensory papillae were dispersed on each side of the anterior part of the worms. These papillae of some excysted metacercariae were arranged irregularly in two rows with 5 to 6 papillae in each row (Figs. 1-8).