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Eukaryotic organisms in Proterozoic oceans.

A H Knoll1, E J Javaux, D Hewitt

  • 1Harvard University, Department of Organismic and Evolutionary Biology, Cambridge, MA 02139, USA. aknoll@oeb.harvard.edu

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|June 7, 2006
PubMed
Summary
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The geological record reveals early eukaryotic evolution through protist fossils, offering insights into cell biology and development despite debates on historical reliability. This research uses fossil evidence to trace the evolutionary history of early life.

Area of Science:

  • Paleontology
  • Evolutionary Biology
  • Geology

Background:

  • The geological record of protists predates the Ediacaran and Cambrian animal diversification.
  • The reliability and interpretation of this early fossil record are subjects of ongoing scientific discussion.
  • Taphonomic factors influence the preservation and representation of early eukaryotic life in the fossil record.

Purpose of the Study:

  • To investigate the antiquity and reliability of the protist geological record as a chronicle of evolution.
  • To infer causal relationships and evolutionary innovations from fossilized protists.
  • To understand the early diversification of eukaryotic clades and cell biology.

Main Methods:

  • Analysis of well-preserved protist fossils from Proterozoic formations.

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  • Examination of problematic, possibly stem-group protists from ancient rocks (ca. 1800-1300 Myr old).
  • Focus on character evolution in Proterozoic eukaryotes to infer cell biology and developmental innovations.

    • Main Results:

    • Fossil protists from ca. 1800-1300 Myr old rocks show modest diversity of early forms.
    • Fossils between 1300-720 Myr old document the divergence of major eukaryotic clades.
    • Increased diversity within most clades with fossilizable members occurred during the Ediacaran-Cambrian animal radiation.

    Conclusions:

    • The presence of key characters in Proterozoic eukaryotes is reliable for taxonomic placement, even if precise placement is debated.
    • Character evolution analysis allows inferences about the innovations driving eukaryotic diversification.
    • The fossil record, despite limitations, provides crucial data for understanding early eukaryotic evolution and cell biology.