Figure 8.11   Early fossil “eukaryotes”. (a) The thread-like Grypania meeki, preserved as a carbonaceous fi lm, from the Greyson Shale, Montana (c. 1.3 Ga). (b, c) Single-celled eukaryotes from the Bitter Springs Chert, Australia (c. 800 Ma): (b) Glenobotrydion showing possible mitosis (cell division in growth), and (c) Eotetrahedrion, probably a cluster of individual Chroococcus-like cyanobacteria. (d) Branching siphonalean-like fi lament. Scale bars: 2 mm (a), 10 µm (b–d). (Courtesy of Martin Brasier, based on various sources.)

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