Figure 2 in Sauropod dinosaur phylogeny: critique and cladistic analysis

Figure 2. Temporal distribution and relationships of major lineages of dinosaurs during the Triassic and Jurassic. The asterisked grey bar represents the ghost lineage preceding the first appearance of sauropods in the fossil record. The diagnostic features of Sauropoda evolved during this implied 15–25 million year interval. Icons from Wilson & Sereno (1998) and Sereno (1999); timescale based on Harland et al. (1990).