FIG. 5.

Comparison between divergences for branch points in the herpesvirus tree and dates of corresponding events in mammalian evolution. The graph compares divergence values (substitutions/site in one lineage) for features in the composite tree (Fig. 4) with dates of possible equivalents in host evolution (10) in millions of years before the present (My). Filled symbols, data from 20-species MC tree; open symbols, data from 46-species tree; squares, α2 sublineage; triangles, β1 sublineage. The line was drawn through the origin and the four highest-value filled symbols. Divergence events and times for filled symbols: humans/chimpanzees, 5.5 My; suidae/ruminants, 64.7 My; artiodactyls/perissodactyls, 83.4 My; primates/ungulates, 92.0 My; primates/rodents, (sciurognathi), 112 My. Similarly for open symbols: human/cercopithecidae, 23.3 My; mice/rats, 40.7 My; feliformia/caniformia, 46.2 My; carnivores/perissodactyls, 74.0 My. Dates in reference 10 included error estimates.