Ediacaran metazoan reveals lophotrochozoan affinity and deepens root of Cambrian Explosion.

Autor:	Shore AJ; School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK. amy.shore@ed.ac.uk., Wood RA; School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK., Butler IB; School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK., Zhuravlev AY; Department of Biological Evolution, Faculty of Biology, Lomonosov Moscow State University, Leninskie Gory, Moscow 119991, Russia., McMahon S; School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK.; UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, James Clerk Maxwell Building, Peter Guthrie Tait Road, Edinburgh EH9 3FD, UK., Curtis A; School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK., Bowyer FT; School of GeoSciences, University of Edinburgh, James Hutton Road, Edinburgh EH9 3FE, UK.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2021 Jan 01; Vol. 7 (1). Date of Electronic Publication: 2021 Jan 01 (Print Publication: 2021).
DOI:	10.1126/sciadv.abf2933
Abstrakt:	Through exceptional preservation, we establish a phylogenetic connection between Ediacaran and Cambrian metazoans. We describe the first three-dimensional, pyritized soft tissue in Namacalathus from the Ediacaran Nama Group, Namibia, which follows the underlying form of a stalked, cup-shaped, calcitic skeleton, with six radially arranged lobes projecting into an apical opening and lateral lumens. A thick body wall and probable J-shaped gut are present within the cup, and the middle layer of the often-spinose skeleton and skeletal pores are selectively pyritized, supporting an organic-rich composition and tripartite construction with possible sensory punctae. These features suggest a total group lophotrochozoan affinity. These morphological data support molecular phylogenies and demonstrates that the origin of modern lophotrochozoan phyla, and their ability to biomineralize, had deep roots in the Ediacaran. (Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).)
Databáze:	MEDLINE
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