Fig. 5From: Phylogenomics of a rapid radiation: is chromosomal evolution linked to increased diversification in north american spiny lizards (Genus Sceloporus)?Speciation and extinction rate changes in Sceloporus. The speciation rate shift in Sceloporus occurred approximately 20–25 million years ago (a), but the magnitude of the shift is low (0.05). Extinction rates appear to be constant through time (b)Back to article page