FIGURE 1.

 
m Evans 1988, 2003; Reynoso 1996, 2000; Zardoya and Meyer 1998, 2001; Evans et al. 2001; Apesteguía and Novas 2003; Rest et al. 2003. Nodes: A, Amniota: B, Diapsida / Reptilia; C, Archosauria; D, Lepidosauria; E, Rhynchocephalia; F, derived rhynchocephalians; G, Sphenodontinae.