金边土鳖Opisthoplatia orientalis Burm消化道内的一种簇虫Gregarina sp.

A GREGARINE(GREGARINA SP),PARASITIC IN OPHISTHOPLATIA ORIENTALIS BURM

在国内有关昆虫簇虫的研究至今未见有报道。本文对簇虫形态及宿主关系进行研究。材料和方法金边土鳖虫来源有野生(广州白云山)及人工饲养(佛山地区农户)两种;采虫后饲养于实验室内,以长55厘米,宽35厘米,高27厘米的玻璃缸饲养;外用黑布遮盖内放瓦片以供土鳖棲息隐蔽。单个饲养或感染时用高10厘米,直径9厘米的玻璃缸饲养。饲料为茶叶渣,番茨及芒萁(Dicranpteris dichotoma)等。

The structure and life history of a species of gregaritic,Gregarina sp.,found in the mid-gut of Ophisihoplatia orientalis Burin,are described.This species of gregarine is Cephalont,its trophozoite is in the shape of worm,measuring 700μm in length.The body is divided by septa into the epimcrite,protomeritc and deutomerite.The epimerite is inserted into the intercellular space of host mid-gut for the absorption of food material.Under scanning electronmicroscope,the folds of body surface of gregarine and the hollows which formed with the intestinal lumen of host can be observed.The life history of gregarine in host includes the intra cellular parasitic stage and the extra-cellular parasitic stage.Sporodins project into the lumen of mid-gut.Pairs of these sporodins associate in syzygy and encyst.Then,the cysts are elimineted in feces.Ophisthoplatia orientalis becomes infected by ingesting infective oocysts as they cat.The parasitic rate of gregarine in Ophisthoplatia orientalis was always 100%.The number of parasites was increased as the host increase in age.