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1 Tree was published in this study

Estimating metazoan divergence times with a molecular clock.
Peterson, Lyons, Nowak, Takacs, Wargo, McPeek. (2004). Proc Natl Acad Sci U S A.
Mollusca Annelida Platyhelminthes Priapulida Arthropoda Saccoglossus Ptychodera Echinodermata Obelia Metridium Ephydatia Monosiga
0 200 400 600 744 Time (MYA)
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