摘要
目的通过扫描电镜观察丰宫并殖吸虫的后尾蚴、不同虫龄的成虫和虫卵,为鉴别虫种提供资料。方法从流行区的溪蟹体内分离丰宫并殖吸虫的后尾蚴,实验感染的大鼠肺虫囊内获取38d和113d成虫及虫卵,经2.5%戊二醛和1%锇酸固定、乙醇脱水及蒸金处理后,用STEREOSCAN-100扫描电镜观察。结果后尾蚴的皮棘为单生型,皮棘的形状有2种类型,即尖刀形和鱼鳞形,腹吸盘与体壁邻接处有6个分布对称的小型圆丘状乳突。不同虫龄的成虫皮棘均为典型的丛生型,虫体前中部的皮棘发达和密集,排列规则;体后部的稀疏,排列不规则。看不出虫龄间的皮棘差异。卵壳表面光滑,卵盖与卵壳连接处可见增厚的肩峰状突起,另一端有一小的疣状突起。结论丰宫并殖吸虫后尾蚴和成虫的皮棘均具有其特有的形态,但同种的不同个体以及同一个体的不同部位,皮棘的大小和形态都显示一定的差异。
Objective To identify the species of Paragonimus proliferus with scanning electron microscopy （SEM） based on the surface structure of excysted metacercariae, adult worms and eggs. Methods Crabs were collected from the endemic area of 19. proliferus and excysted metacercariae were separated. Adult worms at different ages and eggs were obtained from the experimentally infected rats. After being fixed by 2.5% glutardialdehyde and 1% osmic acid, alcohol dehydration, gilded by ion spatter, the specimens were observed under SEM by STEREOSCAN-100. Results The cuticular spines of excysted metacercariae distributed in single pattern, bayonet-shaped or scale-shaped. There were 6 dome-shape papillae around the rim of the ventral sucker symmetrically arranged. The cuticular spines of different age adult worms distributed in group pattern, relatively denser and more regularly arranged in the anterior part than the posterior part of the worm body. The shape and arrangement of the cuticular spines on adult worms at different ages were basically uniform. The surface of eggshell including the operculum was generally smooth. The shell rim joining the operculum was thick and prominent. A knot-like prominence was observed at the aboperculum end. Concbmion The cuticular spines of both excysted metacercariae and adult worms of P. proliferus show its own characteristics, but the size and shape of the cuticular spines among individuals or different parts of the same specimen show certain differences.
出处
《中国寄生虫学与寄生虫病杂志》
CAS
CSCD
北大核心
2005年第5期288-291,共4页
Chinese Journal of Parasitology and Parasitic Diseases
基金
云南省自然科学基金资助项目(No.2005C0046M)~~
关键词
丰宫并殖吸虫
电镜扫描
分类
Paragonimus proliferus
Scanning electron microscopy
Taxonomy
