取样现生鲸偶蹄类的反转录转座子有无数据支持河马科为鲸类的现生姊妹群；该拓扑不是化石年代、直系祖先或命名目录决定。
claim:event:whale-hippo-retroposon-topology图谱首页 / 参考文献 / Phylogenetic relationships among cetartiodactyls based on insertions of short and long interspersed elements: Hippopotamuses are the closest extant relatives of whales
参考文献 / paperPhylogenetic relationships among cetartiodactyls based on insertions of short and long interspersed elements: Hippopotamuses are the closest extant relatives of whales
Nikaido, M.; Rooney, A.P.; Okada, N.
年份1999
来源角色primary-study
DOI / ID10.1073/pnas.96.18.10261
适用范围
拓扑 · methods
The study characterizes 16 new independent retropositional events at 10 loci and analyses 20 informative events across its combined data matrix.
主张账本
鲸河马类 5,500 万年至今的路线采用取整后的始新世早期导航上限，并组合约 4,860 万年前 Indohyus 劳氏兽样本与现生鲸—河马逆转座子拓扑；两项研究都未测定鲸河马类冠群年代，该范围也不是一条谱系的直接延续时长。
claim:taxon:whippomorpha:root-range