Skip to main content Accessibility help
×
Home

A New Enigmatic, Tubular Organism from the Ediacara Member, Rawnsley Quartzite, South Australia

  • Lucas V. Joel (a1), Mary L. Droser (a1) and James G. Gehling (a2)

Abstract

Here we reconstruct a new tubular, serially divided organism with a bilateral morphology from the Ediacaran of South Australia. The organism, Plexus ricei new genus new species, was a broadly curving tube that resided on the Ediacaran seafloor. Plexus ricei individuals range in size from 5 to 80 cm long and 5 to 20 mm wide, and are comprised of two main components: a rigid median tubular structure and a fragile outer tubular wall. Plexus ricei is preserved as an external mold on bed soles, and as a counterpart cast on bed tops in sandstones interpreted to represent deposition between storm and fairweather wave-base. The phylogenetic affinities of P. ricei are uncertain; P. ricei symmetry implies a bilaterian origin, but a lack of defined anterior and posterior ends precludes definitive assignment.

Copyright

References

Hide All
Cohen, P. A., Bradley, A., Knoll, A. H., Grotzinger, J. P., Jensen, S., Abelson, J., Hand, K., Love, G., Metz, J., McLoughlin, N., Meister, P., Shephard, R., Tice, M., and Wilson, J. P. 2009. Tubular compression fossils from the Ediacaran Nama Group, Namibia. Journal of Paleontology, 83:110122.
Droser, M. L., Gehling, J. G., and Jensen, S. R. 2005. Ediacaran trace fossils: true and false, p. 125138. In Briggs, D. E. G. (ed.), Evolving Form and Function: Fossils and Development. Proceedings of a Symposium Honouring Adolph Seilacher for his Contributions to Paleontology in Celebration of his 80th Birthday. Peabody Museum of Natural History, Yale University, New Haven, Connecticut.
Droser, M. L., Gehling, J. G., and Jensen, S. R. 2006. Assemblage paleoecology of the Ediacara biota: The unabridged edition? Palaeogeography, Palaeoclimatology, Palaeoecology, 232:131147.
Droser, M. L. and Gehling, J. G. 2008. Synchronous aggregate growth in an abundant new Ediacaran tubular organism. Science, 319:16601662.
Ekdale, A. A., Bromley, R. G., and Pemberton, S. G. 1984. Ichnology: The use of trace fossils in sedimentology and stratigraphy. SEPM Short Course 15:317.
Gehling, J. G. 1999. Microbial mats in terminal Proterozoic siliciclastics: Ediacaran death masks. Palaios, 14:4057.
Gehling, J. G. 2000. Environmental interpretation and a sequence stratigraphic framework for the terminal Proterozoic Ediacara Member within the Rawnsley Quartzite, South Australia. Precambrian Research, 100:6595.
Gehling, J. G., Droser, M. L., Jensen, S., and Runnegar, B. N. 2005. Ediacara organisms: relating form and function, p. 4366. In Briggs, D. E. G. (ed.), Evolving Form and Function: Fossils and Development. Proceedings of a Symposium Honouring Adolph Seilacher for his Contributions to Paleontology in Celebration of his 80th Birthday. Peabody Museum of Natural History, Yale University, New Haven, Connecticut.
Gehling, J. G. and Droser, M. L. 2009. Textured organic surfaces associated with the Ediacara biota in South Australia. Earth-Science Reviews, 96:196206.
Gehling, J. G. and Droser, M. L. 2012. Ediacaran stratigraphy and the biota of the Adelaide Geosyncline, South Australia. Episodes-Newsmagazine of the International Union of Geological Sciences, 35:236.
Gehling, J. G. and Droser, M. L. 2013. How well do fossil assemblages of the Ediacara Biota tell time? Geology, 41:447450.
Glaessner, M. F. 1969. Trace fossils from the Precambrian and basal Cambrian. Lethaia, 2:369393.
Jensen, S., Droser, M. L., and Gehling, J. G. 2006. A critical look at the Ediacaran trace fossil record, p. 115157. In Xiao, S. and Kaufman, A. J. (eds.), Neoproterozoic Geobiology and Paleobiology. Springer, Netherlands.
Narbonne, G. M. 1998. The Ediacara biota: A terminal Neoproterozoic experiment in the evolution of life. GSA Today, 30:627630.
Preiss, W. V. 1987. Precambrian palaeontology of the Adelaide Geosyncline, p. 283313. In Drexel, J. F. (ed.), The Adelaide Geosyncline–Late Proterozoic Stratigraphy, Sedimentology, Palaeontology and Tectonics. South Australia Geological Survey Bulletin 53.
Sappenfield, A., Droser, M. L., and Gehling, J. G. 2011. Problematica, trace fossils, and tubes within the Ediacara Member (South Australia): Redefining the Ediacaran trace fossil record one tube at a time. Journal of Paleontology, 85:256265.
Tacker, R. C., Martine, A. J., Weaver, P. G., and Lawver, D. R. 2010. Trace fossils versus body fossils: Oldhamia recta revisited. Precambrian Research, 178:4350.
Waggoner, B. 2003. The Ediacaran biota in space and time. Integrative and Comparative Biology, 32:104113.
Xiao, S., Yuan, X., Steiner, M., and Knoll, A. 2002. Macroscopic carbonaceous compressions in a terminal Proterozoic shale: A systematic reassessment of the Miaohe Biota, south China. Journal of Paleontology, 76:347376.
Xiao, S. and Laflamme, M. 2009. On the eve of animal radiation: Phylogeny, ecology and evolution of the Ediacara biota. Trends in Ecology and Evolution, 24:3140.

Related content

Powered by UNSILO

A New Enigmatic, Tubular Organism from the Ediacara Member, Rawnsley Quartzite, South Australia

  • Lucas V. Joel (a1), Mary L. Droser (a1) and James G. Gehling (a2)

Metrics

Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.