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<h2><span style="font-family:arial, helvetica, sans-serif;font-size:small;">Bibliographic references</span></h2> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Arouri</span> K.R., <span>Greenwood</span> P.F. & <span>Walter</span> M.R. (</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">1999</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- A possible chlorophycean affinity of some Neoproterozoic acritarchs.- <em>Organic Geochemistry</em>, Amsterdam, vol. 30, n° 10, p. 1323-1337.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Arouri</span> K.R., <span>Greenwood</span> P.F. & <span>Walter</span> M.R. (</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">2000</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- Biological affinities of Neoproterozoic acritarchs from Australia: microscopic and chemical characterisation - the Savory and Officer Basin.- <em>Organic Geochemistry</em>, Amsterdam, vol. 31, n° 1, p. 75-89.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Bekker</span> A., <span>Holland</span> H.D., <span>Wang</span> P.-L., <span>Rumble</span> D. III, <span>Stein</span> H.J., <span>Hannah</span> J.L., <span>Coetzee</span> L.L. & <span>Beukes</span> N.J. (</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">2004</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- Dating the rise of atmospheric oxygen.- <em>Nature</em>, London, vol. 427, n° 6970, p. 117-120.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Besandahl</span> A. & <span>Bhattacharya</span> D. (</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">1999</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- Evolutionary analyses of small-subunit rDNA coding regions and the 1506 group I introns of Zygnematales (Charophyceae, Streptophyta).- <em>Journal of Phycology</em>, Oxford, vol. 35, n° 3, p. 560-569.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Booton</span> G.C., <span>Floyd</span> G.L. & <span>Fuerst</span> P.A. (</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">1998a</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- Polyphyly of Tetrasporalean green algae inferred from nuclear small-subunit ribosomal DNA.- <em>Journal of Phycology</em>, Oxford, vol. 34, n° 2, p. 306-311.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Booton</span> G.C., <span>Floyd</span> G.L. & <span>Fuerst</span> P.A. (</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">1998b</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- Origins and affinities of the filamentous green algal orders Chaetophorales and Oedogoniales based on 18S rRNA gene sequences.- <em>Journal of Phycology</em>, Oxford, vol. 34, n° 2, p. 312-318.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Brocks</span> J.J., <span>Logan</span> G.A., <span>Buick</span> R. & <span>Summons</span> R.E. (</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">1999</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- Archaean molecular fossils and the early rise of Eukaryotes.- <em>Science</em>, Washington, vol. 285, n° 5430, p. 1033-1036.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Buchheim</span> M.A., <span>Michalopulos</span> E.A. & <span>Buchheim</span> J.A. 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(</span></span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">1983</span><span style="font-family:arial, helvetica, sans-serif;font-size:small;">).- Fossil prasinophycean phycomata (Chlorophyta) from the Silurian Bainbridge Formation, Missouri, U.S.A.- <em>Phycologia</em>, Lawrence, vol. 22, n° 3, p. 249-265.</span> </p> <p> <span style="font-family:arial, helvetica, sans-serif;"><span style="font-size:small;"><span>Denboh</span> T., <span>Hendrayanti</span> D. & <span>Ichimura</span> T. 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