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Trilobozoa, Precambrian Tri-Radial Organisms

Abstract

Representatives of Trilobozoa, a group of tri-radially symmetrical animals, were re-examined based on the material from a new, extensive collection of macrofossils from the Late Ediacaran (Vendian) sediments of the southeastern White Sea region. In addition to body imprints, the collection contains specimens suggesting that trilobozoans could move independently. The shield-like body of trilobozoans consisted of three antimeres. Each antimere has a cluster of grooves on the outer surface and an inner cavity. The system of branched grooves is interpreted as a ciliary organ for gathering food particles, and the elongated inner cavities associated with it are interpreted as digestive organs. It is suggested that trilobozoans were slow-moving benthic seston-feeders of a coelenterate level of organization.

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ACKNOWLEDGMENTS

The photographs were taken by A.V. Mazin (Paleontological Institute, Russian Academy of Sciences, Moscow).

Funding

Fieldwork and preparation of the fossil material were supported by the Russian Foundation for Basic Research, grant no. 17-05-02212-a. Laboratory and theoretical studies were supported by the grant from the Russian Science Foundation (grant no. 19-14-00346) and the grant for fundamental research on the topic of the state assignment at the Paleontological Institute of the Russian Academy of Sciences “The Emergence of Life, the Formation of the Biosphere, and the Development of Ancient Biotas”.

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Correspondence to A. Yu. Ivantsov.

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Translated by S. Nikolaeva

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Ivantsov, A.Y., Zakrevskaya, M.A. Trilobozoa, Precambrian Tri-Radial Organisms. Paleontol. J. 55, 727–741 (2021). https://doi.org/10.1134/S0031030121070066

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  • DOI: https://doi.org/10.1134/S0031030121070066

Keywords:

  • Ediacaran
  • Vendian
  • southeastern White Sea region
  • macrofossils
  • Vendobionta
  • Trilobozoa
  • Tribrachidium
  • Albumares
  • Anfesta