UngulatesHeptodonDiacodexisHapalodectesDissacusSinonyxPakicetusAmbulocetusGaviacetusRodhocetusIndocetusHabib_Rahi_whaleDorudonBasilosaurusZygorhizaXenorophusSqualodonPhyseterMesoplodonTursiopsParietobalaenaEubalaenaBalaenopteraOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Luo_et_Gingerich_1999a