Figure 2 in Global historical biogeography of hadrosaurid dinosaurs

Figure 2. Time-calibrated phylogram of Hadrosauroidea based on the reduced strict consensus tree of Prieto-Márquez (2010). Letters at each node represent ancestral areas as inferred in the dispersal–vicariance analysis; their meaning is as in Fig. 1. The colours of the stratigraphical ranges of taxa indicate the following areas: white, Europe; black, North America; light grey, Asia; dark grey, range of an entire clade. Black stars indicate vicariance. Arrows indicate the direction of dispersal events. Note that the stratigraphical ranges for each species are not point estimates, but just extend to indicate divisions of particular geochronological stages. Geochronological ages from Gradstein, Ogg, Smith (2004). Abbreviations: a, North America; b, South America; c, Europe; d, Asia; ab, North and South America; ac, North America and Europe; ad, North America and Asia; cd, Eurasia.