@article{J. Steppan2017, author = "Scott J. Steppan and John J. Schenk", title = "{Backbone summary phylogeny.}", year = "2017", month = "8", url = "https://plos.figshare.com/articles/figure/Backbone_summary_phylogeny_/5317105", doi = "10.1371/journal.pone.0183070.g001" }