The phylogeny in Figure 4.10 features an unresolved polytomy for lizards and snakes versus turtles versus crocodilians and birds. For a late-breaking study that attempts to resolve this polytomy, see:...

The phylogeny in Figure 4.10 features an unresolved polytomy for lizards and snakes versus turtles

versus crocodilians and birds. For a late-breaking

study that attempts to resolve this polytomy, see:

Crawford, N. G., B. C. Faircloth, et al. 2012. More than 1000 ultraconserved elements provide evidence that turtles are the sister group

of archosaurs. Biology Letters 8: 783–786.