Abstract

The study of the anatomy and fine structure of Echiura is of great importance for understanding the biology of these animals, which lead a secretive life and dominate in various benthic communities. The first data on the organization of the siphonal part of the midgut of female Bonellia viridis were obtained by the methods of scanning and transmission electron microscopy. Unusual concentric inclusions similar in the ultrastructure to those described in other animals, e.g., in the gut of many nematode species and in the tegument of some cestodes, were first found in the cells of the midgut. It is known that, in these animals, the concentric inclusions play an important role in the binding of chemical agents inherent in redox environments. Interestingly, the individuals of B. viridis studied were found on the surface of a substrate devoid of redox environment signs. New results indicate the presence in B. viridis and, possibly, in all spoon worms, of preadaptations to life in redox environments. New data on the structure and composition of concentric inclusions will shed light on their origin and function.

中文翻译：

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Echiura Bonellia viridis 肠上皮中的同心包涵体：结构和可能的功能

摘要

研究 Echiura 的解剖结构和精细结构对于了解这些动物的生物学具有重要意义，这些动物过着神秘的生活并在各种底栖群落中占主导地位。通过扫描和透射电子显微镜的方法获得了第一个关于雌性绿薄参中肠虹吸部分组织的数据。超微结构中与其他动物（例如，许多线虫物种的肠道和一些绦虫的外皮）中描述的超微结构相似的异常同心内含物首先在中肠细胞中发现。众所周知，在这些动物中，同心内含物在氧化还原环境中固有的化学试剂的结合中起着重要作用。有趣的是，B. viridis的个体研究发现在没有氧化还原环境迹象的基材表面。新的结果表明，在B. viridis 中，并且可能在所有的勺虫中都存在对氧化还原环境中生命的预适应。关于同心包裹体结构和成分的新数据将阐明它们的起源和功能。