Moscow State University, 119991, Moscow, Russia.
Dokl Biol Sci. 2021 Jan;496(1):21-24. doi: 10.1134/S0012496621010075. Epub 2021 Feb 26.
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.
研究帚虫动物门的解剖结构和精细结构对于了解这些动物的生物学特性非常重要，因为它们过着隐秘的生活，并且在各种底栖生物群落中占主导地位。Bonellia viridis 雌性中肠的鳃部分的组织结构的首批数据是通过扫描和透射电子显微镜方法获得的。在这些细胞中首次发现了与在其他动物（例如，在许多线虫物种的肠道和一些绦虫的表皮中描述的那些）的超微结构相似的独特的同心内含物。已知在这些动物中，同心内含物在结合氧化还原环境中固有的化学物质方面起着重要作用。有趣的是，在所研究的 B. viridis 个体上发现了存在于没有氧化还原环境迹象的基质表面上。新的结果表明，B. viridis 中可能存在对氧化还原环境生活的预先适应，而所有的匙虫动物门都可能存在这种预先适应。关于同心内含物的结构和组成的新数据将阐明它们的起源和功能。
