Article

Ichnological evidence for meiofaunal bilaterians from the terminal Ediacaran and earliest Cambrian of Brazil

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Abstract

The evolutionary events during the Ediacaran–Cambrian transition (~541 Myr ago) are unparalleled in Earth history. The fossil record suggests that most extant animal phyla appeared in a geologically brief interval, with the oldest unequivocal bilaterian body fossils found in the Early Cambrian. Molecular clocks and biomarkers provide independent estimates for the timing of animal origins, and both suggest a cryptic Neoproterozoic history for Metazoa that extends considerably beyond the Cambrian fossil record. We report an assemblage of ichnofossils from Ediacaran–Cambrian siltstones in Brazil, alongside U–Pb radioisotopic dates that constrain the age of the oldest specimens to 555–542 Myr. X-ray microtomography reveals three-dimensionally preserved traces ranging from 50 to 600 μm in diameter, indicative of small-bodied, meiofaunal tracemakers. Burrow morphologies suggest they were created by a nematoid-like organism that used undulating locomotion to move through the sediment. This assemblage demonstrates animal–sediment interactions in the latest Ediacaran period, and provides the oldest known fossil evidence for meiofaunal bilaterians. Our discovery highlights meiofaunal ichnofossils as a hitherto unexplored window for tracking animal evolution in deep time, and reveals that both meiofaunal and macrofaunal bilaterians began to explore infaunal niches during the late Ediacaran.

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Acknowledgements

We acknowledge the support and guidance of our co-author M. Brasier in the early stages of this work, and particularly his invitation for L.A.P. to undertake fieldwork in Brazil in 2012. Field costs for L.A.P. were supported by an undergraduate travel grant from St. Anne’s College, University of Oxford. Fieldwork costs for M.D.B. were supported by CNPq-Conselho Nacional Desenvolvimento Científico e Tecnológico- Brazil (Proc. 451245/2012-1). This project was supported by an NERC Isotope Geoscience Facilities Steering Committee grant (project IP-1560-0515). J.M.L., P.C.B., R.T., G.A.C.C., C.Q.C.D. and M.L.A.F.P. were supported by grant numbers 2009/02312-4, 2010/02677-0, 2013/17835-8 and 2016-06114-6, São Paulo Research Foundation (FAPESP), Brazil. A.G.L. and L.A.P. are supported by the Natural Environment Research Council (grant numbers NE/L011409/2 and NE/L501554/1, respectively). R.J.G. is a Scientific Associate at the Natural History Museum, London, and a member of the Interdisciplinary Centre for Ancient Life (UMRI). D.M. recognizes the support of an NSERC discovery grant. We are grateful to L. A. dos Santos Reis (Votorantim Cimentos) for facilitating access to the Laginha Mine. We thank L. Tarhan and S. Darroch for constructive reviews.

Author information

Author notes

  1. Martin D. Brasier is deceased.

Affiliations

  1. Palaeobiology, Royal Ontario Museum, 100 Queen’s Park, Toronto, Ontario, M5S 2C6, Canada

    • Luke A. Parry
  2. Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario, M5S 3B2, Canada

    • Luke A. Parry
  3. Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, 05508-080, São Paulo, Brazil

    • Paulo C. Boggiani
    • , Juliana de M. Leme
    • , Ginaldo A. C. Campanha
    •  & Cleber Q. C. Diniz
  4. NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottinghamshire, NG12 5GG, UK

    • Daniel J. Condon
  5. School of Earth and Environmental Sciences, University of Manchester, Manchester, M13 9PL, UK

    • Russell J. Garwood
  6. Department of Earth Sciences, Natural History Museum, Cromwell Road, London, SW7 5BD, UK

    • Russell J. Garwood
  7. Department of Earth Sciences, Memorial University of Newfoundland, Alexander Murray Building, 300 Prince Philip Drive, St. John’s, Newfoundland and Labrador, A1B 3X5, Canada

    • Duncan McIlroy
  8. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, OX1 3AN, UK

    • Martin D. Brasier
  9. Departamento de Geofisica, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, Rua do Matão 1226, 05508-900, São Paulo, Brazil

    • Ricardo Trindade
  10. Department of Biology, Federal University of São Carlos. Rodovia João Leme dos Santos - Parque Reserva Fazenda Imperial, Km 104, 18052780, Sorocaba, Brazil

    • Mírian L. A. F. Pacheco
  11. Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK

    • Alexander G. Liu

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Contributions

L.A.P. found and initially identified the Multina specimens in the Guaicurus Formation. P.C.B., A.G.L., C.Q.C.D. and J.M.L. found the Multina specimens in Tamengo Formation. All authors collaborated to develop this research project. A.G.L. and D.J.C. secured funding for geochronological dating. L.A.P., D.J.C. and R.J.G. conducted the analyses. P.C.B., R.T., J.M.L., C.Q.C.D., M.L.A.F.P. and G.A.C.C. measured the stratigraphic section and collected samples for dating. L.A.P., D.M., D.J.C. and A.G.L. developed the manuscript, and all the authors were involved in data interpretation and the final redrafting of the manuscript.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Luke A. Parry.

Electronic supplementary material

  1. 1.

    Supplementary Information

    Supplementary Figures and Supplementary Tables

  2. 2.

    Supplementary Video 1

    Video of tomographic models