中文摘要：

应用蛋白银方法，对淡水腹毛目纤毛虫四角翁尼柯虫细胞形态发生以及表膜下纤维系统的演化进行了进一步的研究，结果表明，该纤毛虫上海种群显示了与以前报告的模式有明显不同的现象，即在无性生殖期间,前仔虫口围带和口侧膜在老结构位置更新形成；左右缘棘毛的发生与老缘棘毛无明确关联，这不同于尖毛科的其他纤毛虫．棘毛基部纤维包括前纵纤维、后纵纤维、横纤维和放射纤维，其中左缘棘毛基部横纤维的定位与已知几种纤毛虫的同种结构不一样；细胞形态发生中，位于前后额腹横棘毛原基区的纤毛器及其基部纤维瓦解消失，左右缘棘毛原基区中左缘棘毛基部横纤维首先退化解体，这一过程与原基区的分化密切联系，并且老棘毛及其基部纤维对原基的形成和分化可能具有物质贡献；其他纤毛器及其基部纤维在皮层残留的时间较长，它们可能是伴随着老结构逐渐失去功能而退化瓦解的．

英文摘要：

The differentiation of the ciliature and the base associated fibers sion of the fresh water ciliate, Onychodromus quadricornutus （Foissner et during asexual divi al. 1987） were observed by using protargol staining technique. During asexual division of O. quadriconutus, AZM and PM of the proster is formed at the site where the old oral structures is loeated and there is no detectable close relations between the new and old structures during the morphogenesis of left and right marginal cirri, the phenomena different from what found in some known oxytrichids. The eirri base-associated fibers of O. quadriconutus include anterior and posterior longitudinal fi bers, transverse fibers and radiating fibers. The appearance of these fibers are similar to that observed in some known ciliates, except for that of the transverse fibers of left marginal cirri which differs from the known ciliates in loeation. During morphogenesis, the old ciliatures together with their base associated fibers begin to degenerate and disappear in the primordial zone of new anterior and posterior FTV cirri. The base-associated transverse fibers of the old left and right marginal cirri are observed to be the first to disintegrate and degenerate. The disintegration of the base-associated transverse fibers in these parts of old structures shows a close relation with the differentiation of the primordial zone, suggesting an important role of this disintegration in supplying differentiation and development of the primordium with some substances. Other old eiliatures and the base-associated fibers can remain for a relative longer time in the cortex and finally begin to degenerate and disintegrate when their function deelines gradually.