冠突伪尾柱虫腹皮层纤毛器的扫描电镜观察

Scanning electron microscopic observation on the ventral cortical ciliature of Pseudourostyla cristata

应用扫描电镜观察显示了纤毛虫冠突伪尾柱虫(Pseudourostyla cristata)腹皮层纤毛器的形态和形态发生特征。其中每片口围带小膜包括4列副小膜,第1列仅包含3个基体,此列在翻领部与其余3列紧密排列,在领部则位于分隔两列相邻小膜之间的嵴上。口围带在翻领部具有长度不等的侧向纤毛。形态发生中,前仔虫口围带的翻领部和领部两端是完全更新形成的,领部其余部分则保留下来。后仔虫的口围带原基最初于左列中腹棘毛左侧形成。此外,形态发生期间老的口围带小膜后端一部分小膜保留,其随着逐步向后迁移,最后出现在后仔虫口围带的最前端,这部分老的口围带小膜可能对后仔虫口围带的形成有一定的物质贡献作用,或与中腹棘毛共同参与了后仔虫口围带的形成,这可能代表了腹毛类纤毛虫的一种新的口器形成模式。

The characteristics of morphology and morphogenesis of ventral cortical ciliature of ciliate seyla wobserved by scanning electron microscope. Each membranelle of the adoral zone of membranelles （ AZM） included four rows of paramembranelles. The first row only included three basal bodies and arranged closely with other three rows in the lapel part （ AZM- L） , while it was located in the ridge of separating two adjacent membranelles in the collar part （ AZM-C）. The AZM-L had lateral cilia with various length. During morphogenesis, the AZM-L and the ends of AZM-C of the proter were renewed, while the other part of AZM-C were remained. The primordia of AZM of opisthe were formed at the left of left row of mid-ventral cirri. Moreover, some membranelles at the posterior end of old AZM were left during morphogenesis and moved backwards to the most anterior end of AZM of opisthe. These membranelles of old AZM may supply some substances and may take part in the formation of AZM of the opisthe with mid-ventral cirri, which may represent a new mode of stomatogenesis in hypotrichs.