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Coelomic System of the Sea Urchin Strongylocentrotus pallidus (Echinodermata, Echinoidea) and the Issue of Coelomic Metamery in Echinoderms

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Abstract

The representatives of the main phylogenetic clades of Bilateria are characterized by metamery. In Deuterostomia, metamery is presented in hemichordates and chordates. Sea urchins have 7 metameric coelomic rings located along the oral-aboral axis of the body. A similar coelomic metamery is also a sign of representatives of other classes of echinoderms. We hypothesize that the metameric coelomic rings in echinoderms are inherent of the common ancestor of Deuterostomia. Asymmetry in the structure of echinoderm coeloms is the result of ancestral forms lying on the right side of the body, which led to a reduction of the coeloms on the right side. During the sedentary lifestyle, the left-side coeloms formed metameric coelomic rings.

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Funding

Histological studies and computer 3D reconstruction were carried out in the Student Laboratory of Evolutionary Morphology of Animals (www.evolmorphan.ru) of the Department of Invertebrate Zoology, Faculty of Biology, Lomonosov Moscow State University. The study was supported by the Russian Science Foundation (grant no. 18-74-10025).

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Authors and Affiliations

  1. Biological Faculty, Moscow State University, 119991, Moscow, Russia

    O. V. Ezhova, J. A. Kokurkina, K. I. Belolubskaya &  V. V. Malakhov

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  1. O. V. Ezhova
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  2. J. A. Kokurkina
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  3. K. I. Belolubskaya
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  4. V. V. Malakhov
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Correspondence to O. V. Ezhova.

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All applicable international, national and institutional guidelines for the use of animals have been followed.

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The authors have no financial or any other conflicts of interest. All authors have read the final version of the manuscript.

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Translated by D. Martynova

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Ezhova, O.V., Kokurkina, J.A., Belolubskaya, K.I. et al. Coelomic System of the Sea Urchin Strongylocentrotus pallidus (Echinodermata, Echinoidea) and the Issue of Coelomic Metamery in Echinoderms. Dokl Biol Sci 501, 214–219 (2021). https://doi.org/10.1134/S0012496621050021

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