Uncertainty and Underdetermination in Precambrian Paleobiology — Extinct

Uncertainty and Underdetermination in Precambrian Paleobiology — Extinct



There may be one last item to say. A number of of the opposite preservational morphs of Aspidella have names that ought to now be acquainted. These embody Ediacaria (Sprigg’s authentic “jellyfish”) and Spriggia, which Glaessner interpreted as a medusoid. Certainly, as Gehling et al. write, “As soon as the Aspidella morphs have been retrodeformed [restored to their original forms], they can’t be distinguished from different Ediacaran discoidal taxa, and can be recognized variously as Ediacaria, Cyclomedusa, Spriggia, Tirasiana, Irridinitus, or Planomedusites if present in different Ediacaran websites across the globe” (442). The conclusion, once more, is that these names select totally different areas of a morphological continuum, through which a spread of fossil buildings are produced by variations in physique measurement and sedimentary situations.

That is how the “Age of Jellyfish” ends. Not with a bang however a whimper.

References

Bengtson, S. 1986 The issue of the Problematica. In A. Hoffman and M.H. Nitecki (eds.), Problematic Fossil Taxa. Oxford: Oxford College Press, 3–11.

Brasier, M. and Antcliffe, J. 2004. Paleobiology: decoding the Ediacaran enigma. Science 305:1115–1117.

Budd, G.E. and Jensen, S. 2017. The origin of animals and a “Savannah speculation” for early bilaterian evolution. Organic Evaluations of the Cambridge Philosophical Society 92:446–473.

Clark, T.H. 2004. Elkanah Billings (1820–1876)—Canada’s first paleontologist. In R.W. Macqueen (ed.), Proud Heritage: Folks and Progress in Early Canadian Geoscience. Geological Affiliation of Canada, Reprint Sequence #8, 47–49.

Donoghue, P.C.J. and Purnell, M.A. 2009. Distinguishing gentle from warmth in debate over controversial fossils. Bioessays 31:178–189.

Droser, M.L. and Gehling, J.G. 2015. The arrival of animals: the view from the Ediacaran. PNAS 112: 4865–4870.

Dunn, F.S. and Liu, A.G. 2017. Fossil focus: the Ediacara Biota. Paleontology [Online] 7. https://www.palaeontologyonline.com/articles/2017/fossil-focus-ediacaran-biota/

Dunn, F.S. and Liu, A.G. 2019. Viewing the Ediacaran biota as a failed experiment is unhelpful. Nature Ecology & Evolution 3:512–4.

Fedonkin, M.A. 1985. Precambrian metazoans: the issues of preservation, systematics and evolution. Proceedings of the Royal Society, Half B 311:27–45.

Fortey, R.A. 1997. Life: An Unauthorized Biography. London: HarperCollins Publishing.

Gehling, J.G. 1990. The case for Ediacaran fossil roots to the metazoan tree. In B.P. Radhakrishna (ed.), The World of Martin Glaessner, 181–224. Bangalore: Geological Society of India.

Gehling, J.G., Narbonne, G.M., Anderson, M.M. 2003. The primary named Ediacaran physique fossil, Aspidella terranovica. Palaeontology 43:427–456.

Glaessner, M.F. 1959. Precambrian Coelenterata from Australia, Africa and England. Nature 183:1472–3.

Glaessner, M.F. 1961. Pre-Cambrian animals. Scientific American 204:72–8.

Glaessner, M.F. 1984. The Daybreak of Animal Life. A Biohistorical Research. Cambridge: Cambridge College Press.

Glaessner, M.F. and Wade, M. 1966. The late Precambrian fossils from Ediacara, South Australia. Palaeontology 9:97–103.

Grazhdankin, D. 2007. Ediacaran microbial colonies. Lethaia 40:201–210.

Gould, S.J. 1989. Great Life: The Burgess Shale and the That means of Historical past. New York: W.W. Norton & Co.

Jenner, R.A. and Littlefield, D.T.J. 2008. Problematica previous and new. Philosophical Transactions of the Royal Society, Half B 363:1503–1512.

McMenamin, M.A. 1998. The Backyard of Ediacara: Discovering the First Advanced Life. New York: Columbia College Press.

Minicucci, J.M. 2017. Elkanah Billings: The lawyer who revealed the traditional lifetime of the previous. Geosciences Canada 43. https://id.erudit.org/iderudit/1037741ar

Narbonne, G.M. 2005. The Ediacara biota: Neoproterozoic origin of animals and their ecosystems. Annual Evaluate of Earth and Planetary Science 33:421–42.

Peterson, Ok.J., Waggonner, B., Hagadorn, J.W. 2003. A fungal analog for Newfoundland Ediacaran fossils? Integrative and Comparative Biology 43:127–136.

Pflug, H. 1973. Zur Fauna der Nama-Schichten in Südwest-Afrika. IV. Mikroskopische Anatomie der Petalo-Organismen. Palaeontographica Abteilung A 144:166–202.

Retallack, G.J. 1994. Had been the Ediacaran fossils lichens? Paleobiology 20:523–544.

Runnegar, B. 2021. Following the logic behind organic interpretations of the Ediacaran biota. Geological Journal. doi.org/10.1017/S0016756821000443.

Seilacher, A. 1984. Late Precambrian and Early Cambrian Metazoa; preservational or actual extinctions? In H.D. Holland and A.F. Trendall (eds.), Patterns of Change, 159–68. Berlin. Fed. Republic Ger.

Seilacher, A. 1989. Vendozoa: organismic building within the Proterozoic biosphere. Lethaia 22:229–239.

Seilacher, A. 1992. Vendobionta and Psammocorallia: misplaced constructions of Precambrian evolution. Journal of the Geological Society, London 149:607–13.

Sprigg, R.C. 1988. On the 1946 discovery of the Precambrian Ediacaran fossil fauna in South Australia. Earth Sciences Historical past 7:46–51.

Zhuravlev, A.Y. 1993. Had been Ediacaran Vendobionta multicellulars? Neues Jahrbuch für Geologie und Paläontologie 190:299–314.

ADDITIONAL WEB RESOURCES

For a treasure trove of knowledge on Aspidella, see:
http://fossilslanark.blogspot.com/2019/05/photographs-of-gsc-221-one-of-alexander.html

And for a pleasant write-up on the Charnia saga, see:
https://www.damninteresting.com/chronicles-of-charnia/

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