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Figure 11. Stratigraphically calibrated phylogeny of middle Permian through Triassic therocephalians showing calibration points for minimum divergence dates of major clades (A).
Light gray lines represent hypothetical phylogenetic branching, whereas black bars represent observed stratigraphic ranges (dashed ends indicate taxa having unknown upper or lower ranges). Graph (B) shows peak levels of eutherocephalian origination/extinction by the Wuchiapingian stage. Abbreviations: An, Antarctica; Ch, China; Chx, Changxingian;Ci AZ,Cistecephalus Assemblage Zone;Dapto AZ,Daptocephalus Assemblage Zone; Ind, Induan; Na, Namibia; Olen, Olenekian;Prist AZ,Pristerognathus Assemblage Zone; Roa, Roadian; Ru, Russia; SA, South Africa;TapinoAZ,Tapinocephalus Assemblage Zone;Tr AZ,Tropidostoma Assemblage Zone; Tz, Tanzania; Wor, Wordian; Za, Zambia.