异盘并殖吸虫囊蚴和后尾蚴的扫描电镜观察

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

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。

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).