Figure 2 in Near-complete phylogeny of extant Crocodylia (Reptilia) using mitogenome-based data

Figure 2. Time-calibrated phylogeny of the Crocodylia inferred from the complete mitogenomes. These letters (a and b) indicate the calibration points. The blue lines on nodes correspond to the 95% highest posterior density of the age of the node. The bottom axis is in millions of years (Myr). The climatic sequence of events including a global average δ 18O curve (right-hand axis) derived from benthic foraminifera which mirrors the major global temperature trends from the Palaeocene to the Pleistocene (Zachos et al., 2001, 2008). The establishment of ice sheets in the Northern Hemisphere is indicated by grey to black bars on top. Some key tectonic are listed (Zachos et al., 2001). These letters (A, B and C) indicate the families in Crocodylia (Crocodylidae, Gavialidae and Alligatoridae). The numbers on the nodes within Crocodylia indicate node numbers, corresponding to Table 3.