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.
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ACKNOWLEDGMENTS
We express their deep gratitude to Alexander Vadimo-vich Ereskovsky for collecting and fixing the material, Alexei Valer’evich Chesunov and Vladimir Vladimirovich Yushin for valuable scientific advice on the research topic. We are grateful to the team of the interdepartmental laboratory of electron microscopy of the Moscow State University for providing SEM and TEM sessions.
Funding
This study was supported by the Russian Foundation for Basic Research, project no. 20-04-00096.
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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.
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The authors declare that they have no conflict of interest.
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Translated by D. Novikova
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Kuznetsov, P.A., Temereva, E.N. Concentric Inclusions in the Intestinal Epithelium of Echiura Bonellia viridis: Structure and Possible Function. Dokl Biol Sci 496, 21–24 (2021). https://doi.org/10.1134/S0012496621010075
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DOI: https://doi.org/10.1134/S0012496621010075