广州血管圆线虫幼虫和幼龄成虫的扫描电镜观察

应用扫描电镜对广州血管圆线虫各期幼虫和幼龄成虫的体表结构进行了观察.它的口腔在第1、2期幼虫时呈闭合的“Y”形,到幼龄成虫时才发育成熟。口腔周围有内外两圈乳突。每圈各6个;随着虫体的发育,外圈乳突逐渐退化,至成虫时已不易见到。第4期幼虫才明显看到。头感器开口两个,位于内侧乳突的外缘。在虫体前端腹面有一个排泄孔开口,仅在第3期幼虫观察到。雄虫的交合伞自第3期幼虫开始形成,到第25d的幼龄成虫才发育完成,本文对交合伞的形成过程进行了描述。雌虫的生殖孔在第1期幼虫即能见到,但要到第4期幼虫才开始出现肛孔,两者到第11d的幼龄成虫才发育完成。

SCANNING ELECTRON MICROSCOPIC OBSERVATIONS ON LARVAE AND YOUNG ADULTS OF ANGIOSTRONGYLU8 CANTONENSIS

Scanning electron microscopic observations on the structure of the body surface of various larval stages and young adults of Angiostrongylus cantonensis were made. The mouth opening of the first and second stage larvae closes in "Y" form until well developed young adult stage, There are two rows of 6 sensory papillae each around the mouth. With development of the worm, the papillae of the outer row gradually degenerated and could hardly be seen in adult worms. A pair of amphidial pores was present on the external side of lateral papillae of the inner row, being conspicuous in the fourth-stage larvae. There was one excretory pore on the ventral side of the anterior end. The copulatory bursa of the male worms began to develop in the third stage larvae and became well developed in the 25-day young adults. The processes of the development of copulatory bursa were described. The gonopore could be seen in the female worm as early as in the first-stage larvae but the anal pore appeared only in the fourth-stage larvae, both of them did not develop completely until the young adult stage of 11 day old (Figs. 1- 18);