斯氏狸殖吸虫后尾蚴及童虫扫描电镜观察

SCANNING ELECTRON MICROSCOPICAL OBSERVATIONS ON PAGUMOGONIMUS SKRJABINI METACERCARIA AND JUVENILES

本文报告陕西地区斯氏狸殖吸虫7条后尾蚴和12条童虫的扫描电镜观察结果。后尾蚴及童虫体表均有许多褶嵴。后尾蚴体表中线之前及吸盘周围有许多半球形感觉乳突分布。除吸盘周围外,全身布满体棘,前密后稀,呈三角尖刀形或凿形,无纵纹、缺刻及分裂。童虫感觉乳突较后尾蚴显著减少,体棘出现纵纹和缺刻,10～12％的棘已分裂为簇生棘。犬体内童虫与大鼠体内童虫无明显差异。

The present paper reports on the results of scanning electron microscopical observations on seven excysted metacercariae and twelve juveniles of Pagumogonimus skrjabini. The former were from the naturally excysted metacercariae in fresh water in Ningquang District of Shaanxi Province and the latter were collected from the dogs and rats experimentally infected with metacercariae from the District mentioned above.Both excysted metacercariae and juveniles have tegumental ridges or folds on the surface of the body. The anterior two-thirds of the body surface are covered with many dome-shaped sensory papillae. There are rings of this kind of papillae on the rim of oral and ventral suckers. The papillae being obviously in decreasing number in the 30-40-day-old juveniles and adult worms.Except for the suckers and excretory pores, the whole body surface of the metacer-cariae and the juveniles are covered with posteriorly pointing tegumental spines which are relatively denser in the forebody than in the hindbody. Spines around the oral sucker r.re bayonet-shaped, and those on the rest part of the body surface are basically chisel-shaped. The authors considered it important that spines of P. skrjabini can be arranged singly or in groups.