胰阔盘吸虫成虫体表的扫描电镜观察

SCANNING ELECTRON MICROSCOPY OF THE TEGUMENT SURFACE OF THE ADULT EURYTREMA PANCREATICUM

本文报告胰阔盘吸虫的成虫体表扫描电镜观察。虫体表面有纵行的和横行的褶嵴,未见有皮棘。口、腹吸盘的两侧和虫体的后部有蜂巢状区域。虫体表面由大小不等的棒状突起构成,并有许多散在的皮孔。口吸盘大于腹吸盘。口、腹吸盘的内壁有纵行的条纹和圆形乳头。口吸盘的底部有指纹状隆起线。生殖腔位于腹吸盘之前。雄茎从生殖腔伸出。排泄孔在虫体末端。乳头主要分布于口、腹吸盘的唇部、内壁和口、腹吸盘、生殖腔、排泄孔的周围。虫体的其余部位仅有零星散在的乳头分布。有四种类型的乳头。

Pancreatic flukes were obtained from cattle infected with E.pancrea-ticum.Specimens were prepared with routine method and studied using scanning electron microscopy. No spines were observed at low magnification.The tegument surface marked with longitudinal and transeverse wrinkles. Some honeycomb-like regions could be seen at both sides of two suckers and the posterior part of the body. At high magnification the tegument surface was observed to consist of stick-like protuberances. Numerous pores could be seen on the tegument surface.These structures might be the morphological evidence of tegumental absorption function. The oral sucker was bigger than the ventral one. Their lips were thick. Longitudinal striae and round papillae were present on the inner wall of both suckers.In the bottom of the oral sucker fingerprint-like striation could be seen.Common genital atrium lay anterior to the ventral sucker.Cirrus stretched out of it.The excretory pore was situated at the posterior end the body.Papillae were mainly distributed on the lips, inner wall and around the two suckers, common genital atrium and excretory pore. There were a few of papillae scattered randomly over the other part the of body. These papillae were probably sensory organellcs.Four types of papillae were recognized.