<p><b>Copyright information:</b></p><p>Taken from "Molecular phylogeny of the species group, with emphasis on the Old World species"</p><p>http://www.biomedcentral.com/1471-2148/7/87</p><p>BMC Evolutionary Biology 2007;7():87-87.</p><p>Published online 7 Jun 2007</p><p>PMCID:PMC1904182.</p><p></p>aded areas (gray) indicate the time span of temperate forest developing in the Northern Hemisphere . The numbers in the circle indicate the calibration points, and those in the panes indicate the estimated intervals of divergence times in light of the calibration points. For some very recent divergences, the estimates are not shown. Abbreviations: Eo. = Eocene; Oligo. = Oligocene; Mio = Miocene; Plio. = Pliocene; Q. = Quaternary. Symbols are same as in Figure 2
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