The Geological Succession of Primary Producers in the Oceans

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Proterozoic photosynthesis – a critical review (2015, background): “By contrast, a scenario allowing plastid polyphyly within SAR is more readily reconciled with a Phanerozoic – possibly even a Mesozoic – origin of at least some secondary ‘red’ plastids (Knoll et al. 2007).”
Estimating the timing of early eukaryotic diversification with multigene molecular clocks (2011, background): “Eukaryotes, however, have no such capacity; thus, it may not be a coincidence that biomarkers indicating an expanding importance of algae in marine primary production occur in conjunction with geochemical data recording the spread of oxygen through later Neoproterozoic oceans (51).”
Proterozoic phytoplankton and timing of Chlorophyte algae origins (2011, background): “Eukaryotic organisms existed prior to 1000 Ma as shown by body and molecular fossils (Javaux et al. 2004; Butterfield 2005; Javaux and Marshal 2006; Knoll et al. 2007).”
The rise of predators (2011, background): “However, it is also possible that the appearance of protistan skeletons in the mid-Neoprotero-zoic reﬂ ects a shift in the taxonomic contributors to primary productivity (Knoll, 2007).”