Early metazoan life: divergence, environment and ecology.

  title={Early metazoan life: divergence, environment and ecology.},
  author={Douglas H. Erwin},
  journal={Philosophical transactions of the Royal Society of London. Series B, Biological sciences},
  volume={370 1684}
Recent molecular clock studies date the origin of Metazoa to 750-800 million years ago (Ma), roughly coinciding with evidence from geochemical proxies that oxygen levels rose from less than 0.1% present atmospheric level (PAL) to perhaps 1-3% PAL O2. A younger origin of Metazoa would require greatly increased substitution rates across many clades and many genes; while not impossible, this is less parsimonious. Yet the first fossil evidence for metazoans (the Doushantuo embryos) about 600 Ma is… CONTINUE READING
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