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Structure and Origin of the Vestimentiferan Trophosome (Annelida, Siboglinidae)

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Abstract

The anatomical and histological structure of the trophosome of the giant vestimentiferan Riftiapachyptila has been studied. The trophosome consists of longitudinally oriented cords. The cords of the trophosome intertwine, form diverticula and anastomose with each other. Each cord has an axial blood vessel inside, which is connected to afferent vessels on the surface of the cord by radial capillaries. Based on the data on the structure and development of the trophosome, it is suggested that the evolutionary precursor of the trophosome was a blood network connecting the ventral and dorsal vessels. The cells of the coelomic lining on the surface of the vessels grew and gave rise to the parenchymal tissue of the trophosome. At the same time, the trophosome developed from two sources, namely: due to the coelomic lining on the surface of the vessels of the intestinal plexus and due to the coelomic lining on the surface of the vessels of the circulatory plexus of the body wall.

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ACKNOWLEDGMENTS

The authors are deeply grateful to S.V. Galkin (Shirshov Institute of Oceanology, Russian Academy of Sciences), who provided the collections of vestimentiferans.

Funding

The study was supported by the Russian Science Foundation, project no. 18-14-00141-P.

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Authors and Affiliations

  1. Moscow State University, 119992, Moscow, Russia

    V. V. Malakhov, N. N. Rimskaya-Korsakova & M. M. Gantsevich

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  1. V. V. Malakhov
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  2. N. N. Rimskaya-Korsakova
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  3. M. M. Gantsevich
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Corresponding author

Correspondence to M. M. Gantsevich.

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COMPLIANCE WITH ETHICAL STANDARDS

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. Informed consent was obtained from all individual participants involved in the study

CONFLICT OF INTEREST

The authors declare that they have no conflicts of interest.

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Translated by E. Makeeva

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Malakhov, V.V., Rimskaya-Korsakova, N.N. & Gantsevich, M.M. Structure and Origin of the Vestimentiferan Trophosome (Annelida, Siboglinidae). Dokl Biol Sci 502, 42–45 (2022). https://doi.org/10.1134/S0012496622010082

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  • DOI: https://doi.org/10.1134/S0012496622010082

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