Fig. 2.

Timetrees produced by the “Build a Timetree” feature in TToL5 to present an overview of the global timetree. Timetrees of (A) Animal phyla, (B) Animal classes, and (C) mammalian orders are shown. Tip labels are removed due to space constraints, and the timescale is shown in millions of years. Blue dots on nodes can be clicked to view the NCBI name, taxonomic rank, median time, and confidence interval around the median. Polytomies reflect phylogenetic uncertainties caused by conflicting resolutions of species relationships and divergence times among published studies included in TToL5. Users can interact with the timetree display in numerous ways (Kumar et al. 2017) and download the resulting timetree in a Newick or graphic format. One can also view individual timetrees and openly download individual published timetrees used in building the global timetree.