Timing and trends in cell diameter, loss of filamentous forms and habitat preference within cyanobacteria.
Nodes shown (1–10) correspond to Fig. 1 and Table 1. Stars represent common ancestors that appear in Fig. 1 but ages are not given in Table 1. The timing of the Great Oxidation Event (GOE) is after ref. 2, the Lomagundi-Jatuli Excursion after ref. 55 and Gunflint formation after ref. 73. Green lines represent freshwater lineages and blue lines represent marine lineages based on Bayesian inference of character evolution (stochastic character mapping analyses; Supplementary Fig. S4). Cartoons are not drawn according to scale; taxa with smaller cell diameter are shown at the bottom and larger cell diameter at the top.