FIGURE 1. Composite cladogram demonstrating the evolutionary relationships of Sphenodon and other Rhynchocephalia to other amniotes. Dagger designates extinct clade. Based on data from 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.